21300331020 has 48 divisors (see below), whose sum is σ = 59725165920. Its totient is φ = 5672065536.

The previous prime is 21300331009. The next prime is 21300331049. The reversal of 21300331020 is 2013300312.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 207817 + ... + 292896.

It is an arithmetic number, because the mean of its divisors is an integer number (1244274290).

Almost surely, 2^21300331020 is an apocalyptic number.

21300331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300331020 is an abundant number, since it is smaller than the sum of its proper divisors (38424834900).

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

21300331020 is a wasteful number, since it uses less digits than its factorization.

21300331020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501434 (or 501432 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21300331020 its reverse (2013300312), we get a palindrome (23313631332).

The spelling of 21300331020 in words is "twenty-one billion, three hundred million, three hundred thirty-one thousand, twenty".