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200121220212020 = 22517857686804929
BaseRepresentation
bin101101100000001001011010…
…001111100010010100110100
3222020120101211220211212021122
4231200021122033202110310
5202212241224333241040
61545342230331203112
760103165252156412
oct5540113217422464
9866511756755248
10200121220212020
1158845a29729858
121a5409bb8a6498
1387884721c64a3
14375bcc103c2b2
15182092b2241b5
hexb6025a3e2534

200121220212020 has 48 divisors (see below), whose sum is σ = 445494644234640. Its totient is φ = 75251842351104.

The previous prime is 200121220212013. The next prime is 200121220212029. The reversal of 200121220212020 is 20212022121002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 15231879062416 + 184889341149604 = 3902804^2 + 13597402^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 200121220212020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121220212029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343111085 + ... + 343693844.

It is an arithmetic number, because the mean of its divisors is an integer number (9281138421555).

Almost surely, 2200121220212020 is an apocalyptic number.

200121220212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121220212020 is an abundant number, since it is smaller than the sum of its proper divisors (245373424022620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

200121220212020 is a wasteful number, since it uses less digits than its factorization.

200121220212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686805812 (or 686805810 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 200121220212020 its reverse (20212022121002), we get a palindrome (220333242333022).

The spelling of 200121220212020 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, twenty".

Divisors: 1 2 4 5 10 17 20 34 68 85 170 340 857 1714 3428 4285 8570 14569 17140 29138 58276 72845 145690 291380 686804929 1373609858 2747219716 3434024645 6868049290 11675683793 13736098580 23351367586 46702735172 58378418965 116756837930 233513675860 588591824153 1177183648306 2354367296612 2942959120765 5885918241530 10006061010601 11771836483060 20012122021202 40024244042404 50030305053005 100060610106010 200121220212020