20010100201220 has 24 divisors (see below), whose sum is σ = 43046117995608. Its totient is φ = 7808819590400.

The previous prime is 20010100201213. The next prime is 20010100201237. The reversal of 20010100201220 is 2210200101002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1367066054656 + 18643034146564 = 1169216^2 + 4317758^2 .

It is a super-2 number, since 2×20010100201220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12201279791 + ... + 12201281430.

It is an arithmetic number, because the mean of its divisors is an integer number (1793588249817).

Almost surely, 2^{20010100201220} is an apocalyptic number.

20010100201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010100201220 is an abundant number, since it is smaller than the sum of its proper divisors (23036017794388).

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

20010100201220 is a wasteful number, since it uses less digits than its factorization.

20010100201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24402561271 (or 24402561269 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010100201220 its reverse (2210200101002), we get a palindrome (22220300302222).

The spelling of 20010100201220 in words is "twenty trillion, ten billion, one hundred million, two hundred one thousand, two hundred twenty".