231303212320 has 144 divisors (see below), whose sum is σ = 579744459000. Its totient is φ = 87193387008.

The previous prime is 231303212267. The next prime is 231303212323. The reversal of 231303212320 is 23212303132.

It can be written as a sum of positive squares in 4 ways, for example, as 87537873424 + 143765338896 = 295868^2 + 379164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231303212291 and 231303212300.

It is not an unprimeable number, because it can be changed into a prime (231303212323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11137306 + ... + 11158054.

Almost surely, 2^231303212320 is an apocalyptic number.

231303212320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231303212320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289872229500).

231303212320 is an abundant number, since it is smaller than the sum of its proper divisors (348441246680).

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

231303212320 is a wasteful number, since it uses less digits than its factorization.

231303212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20995 (or 20968 counting only the distinct ones).

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

Adding to 231303212320 its reverse (23212303132), we get a palindrome (254515515452).

The spelling of 231303212320 in words is "two hundred thirty-one billion, three hundred three million, two hundred twelve thousand, three hundred twenty".