231111013020 has 48 divisors (see below), whose sum is σ = 647131796640. Its totient is φ = 61627607296.

The previous prime is 231111013009. The next prime is 231111013031. The reversal of 231111013020 is 20310111132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231111013009) and next prime (231111013031).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3331246 + ... + 3399914.

It is an arithmetic number, because the mean of its divisors is an integer number (13481912430).

Almost surely, 2^231111013020 is an apocalyptic number.

231111013020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231111013020 is an abundant number, since it is smaller than the sum of its proper divisors (416020783620).

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

231111013020 is a wasteful number, since it uses less digits than its factorization.

231111013020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124774 (or 124772 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 231111013020 its reverse (20310111132), we get a palindrome (251421124152).

The spelling of 231111013020 in words is "two hundred thirty-one billion, one hundred eleven million, thirteen thousand, twenty".