31132222212 has 96 divisors (see below), whose sum is σ = 89676504064. Its totient is φ = 8185795200.

The previous prime is 31132222193. The next prime is 31132222237. The reversal of 31132222212 is 21222223113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

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, 318387 + ... + 404517.

Almost surely, 2^31132222212 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 31132222212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44838252032).

31132222212 is an abundant number, since it is smaller than the sum of its proper divisors (58544281852).

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

31132222212 is a wasteful number, since it uses less digits than its factorization.

31132222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86489 (or 86487 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 31132222212 its reverse (21222223113), we get a palindrome (52354445325).

Subtracting from 31132222212 its reverse (21222223113), we obtain a palindrome (9909999099).

The spelling of 31132222212 in words is "thirty-one billion, one hundred thirty-two million, two hundred twenty-two thousand, two hundred twelve".