21023402120 has 64 divisors (see below), whose sum is σ = 54251406720. Its totient is φ = 7182526464.

The previous prime is 21023402119. The next prime is 21023402137. The reversal of 21023402120 is 2120432012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53417 + ... + 211896.

It is an arithmetic number, because the mean of its divisors is an integer number (847678230).

Almost surely, 2^21023402120 is an apocalyptic number.

21023402120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023402120 is an abundant number, since it is smaller than the sum of its proper divisors (33228004600).

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

21023402120 is a wasteful number, since it uses less digits than its factorization.

21023402120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265614 (or 265610 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21023402120 its reverse (2120432012), we get a palindrome (23143834132).

The spelling of 21023402120 in words is "twenty-one billion, twenty-three million, four hundred two thousand, one hundred twenty".