21214036265225 has 6 divisors (see below), whose sum is σ = 26305404968910. Its totient is φ = 16971229012160.

The previous prime is 21214036265209. The next prime is 21214036265231. The reversal of 21214036265225 is 52256263041212.

It can be written as a sum of positive squares in 3 ways, for example, as 4235779726201 + 16978256539024 = 2058101^2 + 4120468^2 .

It is not a de Polignac number, because 21214036265225 - 2⁴ = 21214036265209 is a prime.

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, 424280725280 + ... + 424280725329.

It is an arithmetic number, because the mean of its divisors is an integer number (4384234161485).

Almost surely, 2^{21214036265225} is an apocalyptic number.

21214036265225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21214036265225 is a deficient number, since it is larger than the sum of its proper divisors (5091368703685).

21214036265225 is an equidigital number, since it uses as much as digits as its factorization.

21214036265225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848561450619 (or 848561450614 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 21214036265225 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, two hundred sixty-five thousand, two hundred twenty-five".