231213320320 has 32 divisors (see below), whose sum is σ = 552744345420. Its totient is φ = 92485327872.

The previous prime is 231213320291. The next prime is 231213320321. The reversal of 231213320320 is 23023312132.

It can be written as a sum of positive squares in 2 ways, for example, as 213022863936 + 18190456384 = 461544^2 + 134872^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 231213320291 and 231213320300.

It is not an unprimeable number, because it can be changed into a prime (231213320321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180634767 + ... + 180636046.

Almost surely, 2^231213320320 is an apocalyptic number.

231213320320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231213320320 is an abundant number, since it is smaller than the sum of its proper divisors (321531025100).

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

231213320320 is an equidigital number, since it uses as much as digits as its factorization.

231213320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361270832 (or 361270820 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 231213320320 its reverse (23023312132), we get a palindrome (254236632452).

The spelling of 231213320320 in words is "two hundred thirty-one billion, two hundred thirteen million, three hundred twenty thousand, three hundred twenty".