21032312120 has 64 divisors (see below), whose sum is σ = 47969016480. Its totient is φ = 8298602496.

The previous prime is 21032312107. The next prime is 21032312129. The reversal of 21032312120 is 2121323012.

It is a super-2 number, since 2×21032312120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032312129) 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, 1182332 + ... + 1199988.

Almost surely, 2^21032312120 is an apocalyptic number.

21032312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032312120 is an abundant number, since it is smaller than the sum of its proper divisors (26936704360).

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

21032312120 is a wasteful number, since it uses less digits than its factorization.

21032312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18072 (or 18068 counting only the distinct ones).

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

Adding to 21032312120 its reverse (2121323012), we get a palindrome (23153635132).

The spelling of 21032312120 in words is "twenty-one billion, thirty-two million, three hundred twelve thousand, one hundred twenty".