21604136213653 has 16 divisors (see below), whose sum is σ = 25296319851264. Its totient is φ = 18068799813120.

The previous prime is 21604136213641. The next prime is 21604136213701. The reversal of 21604136213653 is 35631263140612.

It is not a de Polignac number, because 21604136213653 - 2⁹ = 21604136213141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604136213603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224019250 + ... + 224115667.

It is an arithmetic number, because the mean of its divisors is an integer number (1581019990704).

Almost surely, 2^{21604136213653} is an apocalyptic number.

It is an amenable number.

21604136213653 is a deficient number, since it is larger than the sum of its proper divisors (3692183637611).

21604136213653 is an equidigital number, since it uses as much as digits as its factorization.

21604136213653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448135092.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 21604136213653 in words is "twenty-one trillion, six hundred four billion, one hundred thirty-six million, two hundred thirteen thousand, six hundred fifty-three".