231021020020 has 48 divisors (see below), whose sum is σ = 554483599488. Its totient is φ = 79202471040.

The previous prime is 231021020017. The next prime is 231021020029. The reversal of 231021020020 is 20020120132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021020029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2949079 + ... + 3026401.

It is an arithmetic number, because the mean of its divisors is an integer number (11551741656).

Almost surely, 2^231021020020 is an apocalyptic number.

231021020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021020020 is an abundant number, since it is smaller than the sum of its proper divisors (323462579468).

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

231021020020 is a wasteful number, since it uses less digits than its factorization.

231021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98680 (or 98678 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 231021020020 its reverse (20020120132), we get a palindrome (251041140152).

The spelling of 231021020020 in words is "two hundred thirty-one billion, twenty-one million, twenty thousand, twenty".