231013013220 has 144 divisors (see below), whose sum is σ = 764716680000. Its totient is φ = 55983110400.

The previous prime is 231013013177. The next prime is 231013013239. The reversal of 231013013220 is 22310310132.

231013013220 is a `hidden beast` number, since 2 + 310 + 1 + 30 + 1 + 322 + 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 = 231013013193 and 231013013202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5942406 + ... + 5981154.

It is an arithmetic number, because the mean of its divisors is an integer number (5310532500).

Almost surely, 2^231013013220 is an apocalyptic number.

231013013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231013013220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382358340000).

231013013220 is an abundant number, since it is smaller than the sum of its proper divisors (533703666780).

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

231013013220 is a wasteful number, since it uses less digits than its factorization.

231013013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41786 (or 41781 counting only the distinct ones).

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

Adding to 231013013220 its reverse (22310310132), we get a palindrome (253323323352).

The spelling of 231013013220 in words is "two hundred thirty-one billion, thirteen million, thirteen thousand, two hundred twenty".