231311021320 has 64 divisors (see below), whose sum is σ = 547905384000. Its totient is φ = 87644544768.

The previous prime is 231311021303. The next prime is 231311021323. The reversal of 231311021320 is 23120113132.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (231311021323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11430171 + ... + 11450389.

It is an arithmetic number, because the mean of its divisors is an integer number (8561021625).

Almost surely, 2^231311021320 is an apocalyptic number.

231311021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311021320 is an abundant number, since it is smaller than the sum of its proper divisors (316594362680).

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

231311021320 is a wasteful number, since it uses less digits than its factorization.

231311021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35302 (or 35298 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231311021320 its reverse (23120113132), we get a palindrome (254431134452).

The spelling of 231311021320 in words is "two hundred thirty-one billion, three hundred eleven million, twenty-one thousand, three hundred twenty".