31122022212 has 18 divisors (see below), whose sum is σ = 78669556238. Its totient is φ = 10374007392.

The previous prime is 31122022207. The next prime is 31122022229. The reversal of 31122022212 is 21222022113.

It can be written as a sum of positive squares in only one way, i.e., 30897202176 + 224820036 = 175776^2 + 14994^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 432250273 + ... + 432250344.

Almost surely, 2^31122022212 is an apocalyptic number.

It is an amenable number.

31122022212 is an abundant number, since it is smaller than the sum of its proper divisors (47547534026).

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

31122022212 is a wasteful number, since it uses less digits than its factorization.

31122022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864500627 (or 864500622 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31122022212 its reverse (21222022113), we get a palindrome (52344044325).

Subtracting from 31122022212 its reverse (21222022113), we obtain a palindrome (9900000099).

The spelling of 31122022212 in words is "thirty-one billion, one hundred twenty-two million, twenty-two thousand, two hundred twelve".