231321012020 has 72 divisors (see below), whose sum is σ = 577107369216. Its totient is φ = 77622597696.

The previous prime is 231321012011. The next prime is 231321012049. The reversal of 231321012020 is 20210123132.

231321012020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 231321012020.

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, 2465024 + ... + 2557143.

It is an arithmetic number, because the mean of its divisors is an integer number (8015380128).

Almost surely, 2^231321012020 is an apocalyptic number.

231321012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231321012020 is an abundant number, since it is smaller than the sum of its proper divisors (345786357196).

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

231321012020 is a wasteful number, since it uses less digits than its factorization.

231321012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5022237 (or 5022228 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 231321012020 its reverse (20210123132), we get a palindrome (251531135152).

The spelling of 231321012020 in words is "two hundred thirty-one billion, three hundred twenty-one million, twelve thousand, twenty".