21604736410225 has 48 divisors (see below), whose sum is σ = 28136534035456. Its totient is φ = 16434998496000.

The previous prime is 21604736410207. The next prime is 21604736410319. The reversal of 21604736410225 is 52201463740612.

It is not a de Polignac number, because 21604736410225 - 2¹³ = 21604736402033 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 47 ways as a sum of consecutive naturals, for example, 45478627 + ... + 45951223.

Almost surely, 2^{21604736410225} is an apocalyptic number.

21604736410225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21604736410225 is a deficient number, since it is larger than the sum of its proper divisors (6531797625231).

21604736410225 is a wasteful number, since it uses less digits than its factorization.

21604736410225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473666 (or 473661 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 21604736410225 in words is "twenty-one trillion, six hundred four billion, seven hundred thirty-six million, four hundred ten thousand, two hundred twenty-five".