31212231232 has 112 divisors (see below), whose sum is σ = 76568929920. Its totient is φ = 12292780032.

The previous prime is 31212231227. The next prime is 31212231263. The reversal of 31212231232 is 23213221213.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1310244 + ... + 1333852.

It is an arithmetic number, because the mean of its divisors is an integer number (683651160).

Almost surely, 2^31212231232 is an apocalyptic number.

31212231232 is a gapful number since it is divisible by the number (32) 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 31212231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38284464960).

31212231232 is an abundant number, since it is smaller than the sum of its proper divisors (45356698688).

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

31212231232 is a wasteful number, since it uses less digits than its factorization.

31212231232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23868 (or 23858 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 31212231232 its reverse (23213221213), we get a palindrome (54425452445).

The spelling of 31212231232 in words is "thirty-one billion, two hundred twelve million, two hundred thirty-one thousand, two hundred thirty-two".