31222222212 has 48 divisors (see below), whose sum is σ = 73419881472. Its totient is φ = 10326539520.

The previous prime is 31222222201. The next prime is 31222222223. The reversal of 31222222212 is 21222222213.

It is an interprime number because it is at equal distance from previous prime (31222222201) and next prime (31222222223).

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 15 ways as a sum of consecutive naturals, for example, 892768 + ... + 927080.

It is an arithmetic number, because the mean of its divisors is an integer number (1529580864).

Almost surely, 2^31222222212 is an apocalyptic number.

It is an amenable number.

31222222212 is an abundant number, since it is smaller than the sum of its proper divisors (42197659260).

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

31222222212 is a wasteful number, since it uses less digits than its factorization.

31222222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34908 (or 34906 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

Adding to 31222222212 its reverse (21222222213), we get a palindrome (52444444425).

Subtracting from 31222222212 its reverse (21222222213), we obtain a palindrome (9999999999).

The spelling of 31222222212 in words is "thirty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twelve".