21250225666225 has 12 divisors (see below), whose sum is σ = 26359155054540. Its totient is φ = 16994454579200.

The previous prime is 21250225666171. The next prime is 21250225666261. The reversal of 21250225666225 is 52266652205212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8276570871409 + 12973654794816 = 2876903^2 + 3601896^2 .

It is not a de Polignac number, because 21250225666225 - 2⁷ = 21250225666097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143073136 + ... + 143221585.

It is an arithmetic number, because the mean of its divisors is an integer number (2196596254545).

Almost surely, 2^{21250225666225} is an apocalyptic number.

21250225666225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21250225666225 is a deficient number, since it is larger than the sum of its proper divisors (5108929388315).

21250225666225 is a wasteful number, since it uses less digits than its factorization.

21250225666225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286297700 (or 286297695 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 21250225666225 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, two hundred twenty-five".