31213323232 has 192 divisors, whose sum is σ = 77325857280. Its totient is φ = 12074489856.

The previous prime is 31213323223. The next prime is 31213323269. The reversal of 31213323232 is 23232331213.

It is a junction number, because it is equal to n+sod(n) for n = 31213323197 and 31213323206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30630819 + ... + 30631837.

It is an arithmetic number, because the mean of its divisors is an integer number (402738840).

Almost surely, 2^31213323232 is an apocalyptic number.

31213323232 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 31213323232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38662928640).

31213323232 is an abundant number, since it is smaller than the sum of its proper divisors (46112534048).

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

31213323232 is a wasteful number, since it uses less digits than its factorization.

31213323232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1265 counting only the distinct ones).

The product of its digits is 3888, while the sum is 25.

Adding to 31213323232 its reverse (23232331213), we get a palindrome (54445654445).

The spelling of 31213323232 in words is "thirty-one billion, two hundred thirteen million, three hundred twenty-three thousand, two hundred thirty-two".