31213202112 has 84 divisors (see below), whose sum is σ = 93356917680. Its totient is φ = 9952031232.

The previous prime is 31213202093. The next prime is 31213202117. The reversal of 31213202112 is 21120231213.

31213202112 is a `hidden beast` number, since 312 + 1 + 320 + 21 + 12 = 666.

It is a super-2 number, since 2×31213202112² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (31213202117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1164787 + ... + 1191282.

Almost surely, 2^31213202112 is an apocalyptic number.

31213202112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31213202112 is an abundant number, since it is smaller than the sum of its proper divisors (62143715568).

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

31213202112 is a wasteful number, since it uses less digits than its factorization.

31213202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356110 (or 2356097 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31213202112 its reverse (21120231213), we get a palindrome (52333433325).

The spelling of 31213202112 in words is "thirty-one billion, two hundred thirteen million, two hundred two thousand, one hundred twelve".