231312330220 has 96 divisors (see below), whose sum is σ = 521809102080. Its totient is φ = 85820067840.

The previous prime is 231312330199. The next prime is 231312330229. The reversal of 231312330220 is 22033213132.

It is a super-2 number, since 2×231312330220² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231312330191 and 231312330200.

It is not an unprimeable number, because it can be changed into a prime (231312330229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14953290 + ... + 14968750.

It is an arithmetic number, because the mean of its divisors is an integer number (5435511480).

Almost surely, 2^231312330220 is an apocalyptic number.

231312330220 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 231312330220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260904551040).

231312330220 is an abundant number, since it is smaller than the sum of its proper divisors (290496771860).

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

231312330220 is a wasteful number, since it uses less digits than its factorization.

231312330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16123 (or 16121 counting only the distinct ones).

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

Adding to 231312330220 its reverse (22033213132), we get a palindrome (253345543352).

The spelling of 231312330220 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred thirty thousand, two hundred twenty".