21031030020320 has 48 divisors (see below), whose sum is σ = 52608503042928. Its totient is φ = 7917564241920.

The previous prime is 21031030020307. The next prime is 21031030020361. The reversal of 21031030020320 is 2302003013012.

It is a super-2 number, since 2×21031030020320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3865995446 + ... + 3866000885.

It is an arithmetic number, because the mean of its divisors is an integer number (1096010480061).

Almost surely, 2^{21031030020320} is an apocalyptic number.

21031030020320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031030020320 is an abundant number, since it is smaller than the sum of its proper divisors (31577473022608).

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

21031030020320 is a wasteful number, since it uses less digits than its factorization.

21031030020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7731996363 (or 7731996355 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21031030020320 its reverse (2302003013012), we get a palindrome (23333033033332).

The spelling of 21031030020320 in words is "twenty-one trillion, thirty-one billion, thirty million, twenty thousand, three hundred twenty".