231311131021 has 8 divisors (see below), whose sum is σ = 231444591840. Its totient is φ = 231177714768.

The previous prime is 231311131019. The next prime is 231311131027. The reversal of 231311131021 is 120131113132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231311131021 - 2¹ = 231311131019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231311131021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311131027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16683390 + ... + 16697248.

It is an arithmetic number, because the mean of its divisors is an integer number (28930573980).

Almost surely, 2^231311131021 is an apocalyptic number.

It is an amenable number.

231311131021 is a deficient number, since it is larger than the sum of its proper divisors (133460819).

231311131021 is a wasteful number, since it uses less digits than its factorization.

231311131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22283.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 231311131021 its reverse (120131113132), we get a palindrome (351442244153).

The spelling of 231311131021 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred thirty-one thousand, twenty-one".