31973803045621 has 2 divisors, whose sum is σ = 31973803045622. Its totient is φ = 31973803045620.

The previous prime is 31973803045519. The next prime is 31973803045643. The reversal of 31973803045621 is 12654030837913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26187926047396 + 5785876998225 = 5117414^2 + 2405385^2 .

It is a cyclic number.

It is not a de Polignac number, because 31973803045621 - 2¹⁷ = 31973802914549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31973803045651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986901522810 + 15986901522811.

It is an arithmetic number, because the mean of its divisors is an integer number (15986901522811).

It is a 1-persistent number, because it is pandigital, but 2⋅31973803045621 = 63947606091242 is not.

Almost surely, 2^{31973803045621} is an apocalyptic number.

It is an amenable number.

31973803045621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31973803045621 is an equidigital number, since it uses as much as digits as its factorization.

31973803045621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 31973803045621 in words is "thirty-one trillion, nine hundred seventy-three billion, eight hundred three million, forty-five thousand, six hundred twenty-one".