231213220320 has 96 divisors (see below), whose sum is σ = 728673781248. Its totient is φ = 61627048448.

The previous prime is 231213220289. The next prime is 231213220327. The reversal of 231213220320 is 23022312132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213220327) 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, 886357 + ... + 1117163.

It is an arithmetic number, because the mean of its divisors is an integer number (7590351888).

Almost surely, 2^231213220320 is an apocalyptic number.

231213220320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231213220320 is an abundant number, since it is smaller than the sum of its proper divisors (497460560928).

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

231213220320 is a wasteful number, since it uses less digits than its factorization.

231213220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232912 (or 232904 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 231213220320 its reverse (23022312132), we get a palindrome (254235532452).

The spelling of 231213220320 in words is "two hundred thirty-one billion, two hundred thirteen million, two hundred twenty thousand, three hundred twenty".