31221851056 has 40 divisors (see below), whose sum is σ = 66071552400. Its totient is φ = 14174565120.

The previous prime is 31221851053. The next prime is 31221851077. The reversal of 31221851056 is 65015812213.

It is not an unprimeable number, because it can be changed into a prime (31221851053) 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, 38910 + ... + 252898.

It is an arithmetic number, because the mean of its divisors is an integer number (1651788810).

Almost surely, 2^31221851056 is an apocalyptic number.

It is an amenable number.

31221851056 is an abundant number, since it is smaller than the sum of its proper divisors (34849701344).

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

31221851056 is a wasteful number, since it uses less digits than its factorization.

31221851056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214837 (or 214831 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 31221851056 in words is "thirty-one billion, two hundred twenty-one million, eight hundred fifty-one thousand, fifty-six".