31011331212 has 72 divisors (see below), whose sum is σ = 80423594160. Its totient is φ = 10069678080.

The previous prime is 31011331199. The next prime is 31011331237. The reversal of 31011331212 is 21213311013.

31011331212 is a `hidden beast` number, since 310 + 1 + 1 + 331 + 21 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 977739 + ... + 1008957.

Almost surely, 2^31011331212 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 31011331212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40211797080).

31011331212 is an abundant number, since it is smaller than the sum of its proper divisors (49412262948).

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

31011331212 is a wasteful number, since it uses less digits than its factorization.

31011331212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31943 (or 31938 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31011331212 its reverse (21213311013), we get a palindrome (52224642225).

The spelling of 31011331212 in words is "thirty-one billion, eleven million, three hundred thirty-one thousand, two hundred twelve".