2056689250921 has 2 divisors, whose sum is σ = 2056689250922. Its totient is φ = 2056689250920.

The previous prime is 2056689250907. The next prime is 2056689250937. The reversal of 2056689250921 is 1290529866502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1342307616400 + 714381634521 = 1158580^2 + 845211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056689250921 - 2⁷ = 2056689250793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2056689250961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028344625460 + 1028344625461.

It is an arithmetic number, because the mean of its divisors is an integer number (1028344625461).

Almost surely, 2^{2056689250921} is an apocalyptic number.

It is an amenable number.

2056689250921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056689250921 is an equidigital number, since it uses as much as digits as its factorization.

2056689250921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 2056689250921 in words is "two trillion, fifty-six billion, six hundred eighty-nine million, two hundred fifty thousand, nine hundred twenty-one".