31229851212 has 96 divisors (see below), whose sum is σ = 92598374400. Its totient is φ = 8916500736.

The previous prime is 31229851171. The next prime is 31229851223. The reversal of 31229851212 is 21215892213.

31229851212 is a `hidden beast` number, since 3 + 122 + 9 + 8 + 512 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 1111813 + ... + 1139555.

It is an arithmetic number, because the mean of its divisors is an integer number (964566400).

Almost surely, 2^31229851212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31229851212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46299187200).

31229851212 is an abundant number, since it is smaller than the sum of its proper divisors (61368523188).

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

31229851212 is a wasteful number, since it uses less digits than its factorization.

31229851212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29252 (or 29244 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 31229851212 in words is "thirty-one billion, two hundred twenty-nine million, eight hundred fifty-one thousand, two hundred twelve".