57031235671021 has 2 divisors, whose sum is σ = 57031235671022. Its totient is φ = 57031235671020.

The previous prime is 57031235670989. The next prime is 57031235671061. The reversal of 57031235671021 is 12017653213075.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56949888645225 + 81347025796 = 7546515^2 + 285214^2 .

It is a cyclic number.

It is not a de Polignac number, because 57031235671021 - 2⁵ = 57031235670989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57031235671061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28515617835510 + 28515617835511.

It is an arithmetic number, because the mean of its divisors is an integer number (28515617835511).

Almost surely, 2^{57031235671021} is an apocalyptic number.

It is an amenable number.

57031235671021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57031235671021 is an equidigital number, since it uses as much as digits as its factorization.

57031235671021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264600, while the sum is 43.

Adding to 57031235671021 its reverse (12017653213075), we get a palindrome (69048888884096).

The spelling of 57031235671021 in words is "fifty-seven trillion, thirty-one billion, two hundred thirty-five million, six hundred seventy-one thousand, twenty-one".