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21101210120 = 235539953401
BaseRepresentation
bin10011101001101110…
…101110101000001000
32000110120122112112202
4103221232232220020
5321203402210440
613405504055332
71344623220014
oct235156565010
960416575482
1021101210120
118a490a0531
12410a904548
131cb3890363
14104265b544
15837790615
hex4e9baea08

21101210120 has 32 divisors (see below), whose sum is σ = 48373533720. Its totient is φ = 8281228800.

The previous prime is 21101210093. The next prime is 21101210159. The reversal of 21101210120 is 2101210112.

It can be written as a sum of positive squares in 4 ways, for example, as 18475877476 + 2625332644 = 135926^2 + 51238^2 .

It is a super-2 number, since 2×211012101202 (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4974581 + ... + 4978820.

Almost surely, 221101210120 is an apocalyptic number.

21101210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101210120 is an abundant number, since it is smaller than the sum of its proper divisors (27272323600).

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

21101210120 is a wasteful number, since it uses less digits than its factorization.

21101210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953465 (or 9953461 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101210120 its reverse (2101210112), we get a palindrome (23202420232).

The spelling of 21101210120 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, one hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 53 106 212 265 424 530 1060 2120 9953401 19906802 39813604 49767005 79627208 99534010 199068020 398136040 527530253 1055060506 2110121012 2637651265 4220242024 5275302530 10550605060 21101210120