231231132301220 has 48 divisors (see below), whose sum is σ = 493555958032368. Its totient is φ = 90974309621760.

The previous prime is 231231132301153. The next prime is 231231132301237. The reversal of 231231132301220 is 22103231132132.

It can be written as a sum of positive squares in 8 ways, for example, as 126590221517824 + 104640910783396 = 11251232^2 + 10229414^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231231132301220.

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, 58068884 + ... + 61922996.

It is an arithmetic number, because the mean of its divisors is an integer number (10282415792341).

Almost surely, 2^{231231132301220} is an apocalyptic number.

231231132301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231231132301220 is an abundant number, since it is smaller than the sum of its proper divisors (262324825731148).

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

231231132301220 is a wasteful number, since it uses less digits than its factorization.

231231132301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903360 (or 3903358 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 231231132301220 its reverse (22103231132132), we get a palindrome (253334363433352).

The spelling of 231231132301220 in words is "two hundred thirty-one trillion, two hundred thirty-one billion, one hundred thirty-two million, three hundred one thousand, two hundred twenty".