21604727252576 has 96 divisors (see below), whose sum is σ = 46955882046528. Its totient is φ = 9721473269760.

The previous prime is 21604727252573. The next prime is 21604727252587. The reversal of 21604727252576 is 67525272740612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604727252573) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 24242336 + ... + 25117728.

It is an arithmetic number, because the mean of its divisors is an integer number (489123771318).

Almost surely, 2^{21604727252576} is an apocalyptic number.

21604727252576 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21604727252576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23477941023264).

21604727252576 is an abundant number, since it is smaller than the sum of its proper divisors (25351154793952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21604727252576 is a wasteful number, since it uses less digits than its factorization.

21604727252576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876904 (or 876896 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 56.

The spelling of 21604727252576 in words is "twenty-one trillion, six hundred four billion, seven hundred twenty-seven million, two hundred fifty-two thousand, five hundred seventy-six".