31221222108 has 24 divisors (see below), whose sum is σ = 72853939200. Its totient is φ = 10406442480.

The previous prime is 31221222049. The next prime is 31221222127. The reversal of 31221222108 is 80122212213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154693 + ... + 293891.

It is an arithmetic number, because the mean of its divisors is an integer number (3035580800).

Almost surely, 2^31221222108 is an apocalyptic number.

It is an amenable number.

31221222108 is an abundant number, since it is smaller than the sum of its proper divisors (41632717092).

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

31221222108 is a wasteful number, since it uses less digits than its factorization.

31221222108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157897 (or 157895 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The spelling of 31221222108 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eight".