231013201321 has 12 divisors (see below), whose sum is σ = 273135049860. Its totient is φ = 194765225760.

The previous prime is 231013201261. The next prime is 231013201357. The reversal of 231013201321 is 123102310132.

It can be written as a sum of positive squares in 2 ways, for example, as 116322605721 + 114690595600 = 341061^2 + 338660^2 .

It is not a de Polignac number, because 231013201321 - 2⁹ = 231013200809 is a prime.

It is a super-2 number, since 2×231013201321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231013201921) 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, 38640906 + ... + 38646883.

It is an arithmetic number, because the mean of its divisors is an integer number (22761254155).

Almost surely, 2^231013201321 is an apocalyptic number.

It is an amenable number.

231013201321 is a deficient number, since it is larger than the sum of its proper divisors (42121848539).

231013201321 is an equidigital number, since it uses as much as digits as its factorization.

231013201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77287864 (or 77287857 counting only the distinct ones).

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

Adding to 231013201321 its reverse (123102310132), we get a palindrome (354115511453).

The spelling of 231013201321 in words is "two hundred thirty-one billion, thirteen million, two hundred one thousand, three hundred twenty-one".