21604136223653 has 8 divisors (see below), whose sum is σ = 21629878747776. Its totient is φ = 21578408869600.

The previous prime is 21604136223647. The next prime is 21604136223671. The reversal of 21604136223653 is 35632263140612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21604136223653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604136223613) 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 7 ways as a sum of consecutive naturals, for example, 941288 + ... + 6640353.

It is an arithmetic number, because the mean of its divisors is an integer number (2703734843472).

Almost surely, 2^{21604136223653} is an apocalyptic number.

It is an amenable number.

21604136223653 is a deficient number, since it is larger than the sum of its proper divisors (25742524123).

21604136223653 is a wasteful number, since it uses less digits than its factorization.

21604136223653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585035.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 21604136223653 in words is "twenty-one trillion, six hundred four billion, one hundred thirty-six million, two hundred twenty-three thousand, six hundred fifty-three".