231311021013 has 12 divisors (see below), whose sum is σ = 335348822848. Its totient is φ = 153638314920.

The previous prime is 231311020957. The next prime is 231311021017. The reversal of 231311021013 is 310120113132.

It is not a de Polignac number, because 231311021013 - 2¹⁴ = 231311004629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311021017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47416795 + ... + 47421672.

Almost surely, 2^231311021013 is an apocalyptic number.

It is an amenable number.

231311021013 is a deficient number, since it is larger than the sum of its proper divisors (104037801835).

231311021013 is a wasteful number, since it uses less digits than its factorization.

231311021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94838744 (or 94838741 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 231311021013 its reverse (310120113132), we get a palindrome (541431134145).

The spelling of 231311021013 in words is "two hundred thirty-one billion, three hundred eleven million, twenty-one thousand, thirteen".