231021313020 has 72 divisors (see below), whose sum is σ = 723369978240. Its totient is φ = 59618401920.

The previous prime is 231021313001. The next prime is 231021313043. The reversal of 231021313020 is 20313120132.

231021313020 is a `hidden beast` number, since 2 + 310 + 21 + 31 + 302 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231021312984 and 231021313002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20695255 + ... + 20706414.

Almost surely, 2^231021313020 is an apocalyptic number.

231021313020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021313020 is an abundant number, since it is smaller than the sum of its proper divisors (492348665220).

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

231021313020 is a wasteful number, since it uses less digits than its factorization.

231021313020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41401715 (or 41401710 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 231021313020 its reverse (20313120132), we get a palindrome (251334433152).

The spelling of 231021313020 in words is "two hundred thirty-one billion, twenty-one million, three hundred thirteen thousand, twenty".