31221002140 has 12 divisors (see below), whose sum is σ = 65564104536. Its totient is φ = 12488400848.

The previous prime is 31221002117. The next prime is 31221002167. The reversal of 31221002140 is 4120012213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780525034 + ... + 780525073.

It is an arithmetic number, because the mean of its divisors is an integer number (5463675378).

Almost surely, 2^31221002140 is an apocalyptic number.

It is an amenable number.

31221002140 is an abundant number, since it is smaller than the sum of its proper divisors (34343102396).

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

31221002140 is a wasteful number, since it uses less digits than its factorization.

31221002140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561050116 (or 1561050114 counting only the distinct ones).

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

Adding to 31221002140 its reverse (4120012213), we get a palindrome (35341014353).

The spelling of 31221002140 in words is "thirty-one billion, two hundred twenty-one million, two thousand, one hundred forty".