31221104312 has 8 divisors (see below), whose sum is σ = 58539570600. Its totient is φ = 15610552152.

The previous prime is 31221104261. The next prime is 31221104329. The reversal of 31221104312 is 21340112213.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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, 1951319012 + ... + 1951319027.

It is an arithmetic number, because the mean of its divisors is an integer number (7317446325).

Almost surely, 2^31221104312 is an apocalyptic number.

It is an amenable number.

31221104312 is a deficient number, since it is larger than the sum of its proper divisors (27318466288).

31221104312 is a wasteful number, since it uses less digits than its factorization.

31221104312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902638045 (or 3902638041 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31221104312 its reverse (21340112213), we get a palindrome (52561216525).

The spelling of 31221104312 in words is "thirty-one billion, two hundred twenty-one million, one hundred four thousand, three hundred twelve".