231212112320 has 112 divisors (see below), whose sum is σ = 630069685248. Its totient is φ = 79166592000.

The previous prime is 231212112227. The next prime is 231212112323. The reversal of 231212112320 is 23211212132.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 231212112292 and 231212112301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212112323) 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, 1613519 + ... + 1750961.

Almost surely, 2^231212112320 is an apocalyptic number.

231212112320 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 231212112320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315034842624).

231212112320 is an abundant number, since it is smaller than the sum of its proper divisors (398857572928).

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

231212112320 is a wasteful number, since it uses less digits than its factorization.

231212112320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138218 (or 138208 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 231212112320 its reverse (23211212132), we get a palindrome (254423324452).

The spelling of 231212112320 in words is "two hundred thirty-one billion, two hundred twelve million, one hundred twelve thousand, three hundred twenty".