31645122212 has 24 divisors (see below), whose sum is σ = 63593070240. Its totient is φ = 13627085760.

The previous prime is 31645122211. The next prime is 31645122259. The reversal of 31645122212 is 21222154613.

It is not an unprimeable number, because it can be changed into a prime (31645122211) 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 in 7 ways as a sum of consecutive naturals, for example, 18925673 + ... + 18927344.

It is an arithmetic number, because the mean of its divisors is an integer number (2649711260).

Almost surely, 2^31645122212 is an apocalyptic number.

It is an amenable number.

31645122212 is an abundant number, since it is smaller than the sum of its proper divisors (31947948028).

31645122212 is a wasteful number, since it uses less digits than its factorization.

31645122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37853051 (or 37853049 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

Adding to 31645122212 its reverse (21222154613), we get a palindrome (52867276825).

The spelling of 31645122212 in words is "thirty-one billion, six hundred forty-five million, one hundred twenty-two thousand, two hundred twelve".