2640325921 has 2 divisors, whose sum is σ = 2640325922. Its totient is φ = 2640325920.

The previous prime is 2640325907. The next prime is 2640325927. The reversal of 2640325921 is 1295230462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1669131025 + 971194896 = 40855^2 + 31164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640325921 - 2⁵ = 2640325889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2640325927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320162960 + 1320162961.

It is an arithmetic number, because the mean of its divisors is an integer number (1320162961).

Almost surely, 2^2640325921 is an apocalyptic number.

It is an amenable number.

2640325921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640325921 is an equidigital number, since it uses as much as digits as its factorization.

2640325921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 2640325921 is about 51384.1018312085. The cubic root of 2640325921 is about 1382.1415187137.

The spelling of 2640325921 in words is "two billion, six hundred forty million, three hundred twenty-five thousand, nine hundred twenty-one".