21310322120 has 32 divisors (see below), whose sum is σ = 50768710200. Its totient is φ = 8022709248.

The previous prime is 21310322113. The next prime is 21310322149. The reversal of 21310322120 is 2122301312.

It can be written as a sum of positive squares in 4 ways, for example, as 16898440036 + 4411882084 = 129994^2 + 66422^2 .

It is a super-2 number, since 2×21310322120² (a number of 21 digits) contains 22 as substring.

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

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, 15668675 + ... + 15670034.

Almost surely, 2^21310322120 is an apocalyptic number.

21310322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310322120 is an abundant number, since it is smaller than the sum of its proper divisors (29458388080).

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

21310322120 is a wasteful number, since it uses less digits than its factorization.

21310322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31338737 (or 31338733 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21310322120 its reverse (2122301312), we get a palindrome (23432623432).

The spelling of 21310322120 in words is "twenty-one billion, three hundred ten million, three hundred twenty-two thousand, one hundred twenty".