21023320120 has 64 divisors (see below), whose sum is σ = 52182597600. Its totient is φ = 7558932480.

The previous prime is 21023320111. The next prime is 21023320121. The reversal of 21023320120 is 2102332012.

It is a junction number, because it is equal to n+sod(n) for n = 21023320094 and 21023320103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023320121) 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, 229269 + ... + 307588.

Almost surely, 2^21023320120 is an apocalyptic number.

21023320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023320120 is an abundant number, since it is smaller than the sum of its proper divisors (31159277480).

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

21023320120 is a wasteful number, since it uses less digits than its factorization.

21023320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536968 (or 536964 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21023320120 its reverse (2102332012), we get a palindrome (23125652132).

It can be divided in two parts, 21023 and 320120, that added together give a palindrome (341143).

The spelling of 21023320120 in words is "twenty-one billion, twenty-three million, three hundred twenty thousand, one hundred twenty".