21113024020 has 48 divisors (see below), whose sum is σ = 48676174848. Its totient is φ = 7628549760.

The previous prime is 21113024003. The next prime is 21113024033. The reversal of 21113024020 is 2042031112.

It is a junction number, because it is equal to n+sod(n) for n = 21113023985 and 21113024003.

It is a congruent number.

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, 271092 + ... + 340171.

It is an arithmetic number, because the mean of its divisors is an integer number (1014086976).

Almost surely, 2^21113024020 is an apocalyptic number.

21113024020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113024020 is an abundant number, since it is smaller than the sum of its proper divisors (27563150828).

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

21113024020 is a wasteful number, since it uses less digits than its factorization.

21113024020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611440 (or 611438 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21113024020 its reverse (2042031112), we get a palindrome (23155055132).

The spelling of 21113024020 in words is "twenty-one billion, one hundred thirteen million, twenty-four thousand, twenty".