21264444056425 has 6 divisors (see below), whose sum is σ = 26367910629998. Its totient is φ = 17011555245120.

The previous prime is 21264444056327. The next prime is 21264444056441. The reversal of 21264444056425 is 52465044446212.

It can be written as a sum of positive squares in 3 ways, for example, as 237056029456 + 21027388026969 = 486884^2 + 4585563^2 .

It is not a de Polignac number, because 21264444056425 - 2³⁷ = 21127005102953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 425288881104 + ... + 425288881153.

Almost surely, 2^{21264444056425} is an apocalyptic number.

21264444056425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21264444056425 is a deficient number, since it is larger than the sum of its proper divisors (5103466573573).

21264444056425 is an equidigital number, since it uses as much as digits as its factorization.

21264444056425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850577762267 (or 850577762262 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 49.

The spelling of 21264444056425 in words is "twenty-one trillion, two hundred sixty-four billion, four hundred forty-four million, fifty-six thousand, four hundred twenty-five".