31021022212 has 6 divisors (see below), whose sum is σ = 54286788878. Its totient is φ = 15510511104.

The previous prime is 31021022171. The next prime is 31021022213. The reversal of 31021022212 is 21222012013.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21577847236 + 9443174976 = 146894^2 + 97176^2 .

It is not an unprimeable number, because it can be changed into a prime (31021022213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3877627773 + ... + 3877627780.

Almost surely, 2^31021022212 is an apocalyptic number.

It is an amenable number.

31021022212 is a deficient number, since it is larger than the sum of its proper divisors (23265766666).

31021022212 is a wasteful number, since it uses less digits than its factorization.

31021022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7755255557 (or 7755255555 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31021022212 its reverse (21222012013), we get a palindrome (52243034225).

The spelling of 31021022212 in words is "thirty-one billion, twenty-one million, twenty-two thousand, two hundred twelve".