31627961021 has 2 divisors, whose sum is σ = 31627961022. Its totient is φ = 31627961020.

The previous prime is 31627960999. The next prime is 31627961033. The reversal of 31627961021 is 12016972613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16550822500 + 15077138521 = 128650^2 + 122789^2 .

It is a cyclic number.

It is not a de Polignac number, because 31627961021 - 2³⁴ = 14448091837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31627961921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15813980510 + 15813980511.

It is an arithmetic number, because the mean of its divisors is an integer number (15813980511).

Almost surely, 2^31627961021 is an apocalyptic number.

It is an amenable number.

31627961021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31627961021 is an equidigital number, since it uses as much as digits as its factorization.

31627961021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 31627961021 in words is "thirty-one billion, six hundred twenty-seven million, nine hundred sixty-one thousand, twenty-one".