21604918837139 has 8 divisors (see below), whose sum is σ = 23900960148480. Its totient is φ = 19364203822600.

The previous prime is 21604918837121. The next prime is 21604918837153. The reversal of 21604918837139 is 93173881940612.

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

It is a cyclic number.

It is not a de Polignac number, because 21604918837139 - 2²⁰ = 21604917788563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21604918837039) 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, 13831573379 + ... + 13831574940.

It is an arithmetic number, because the mean of its divisors is an integer number (2987620018560).

Almost surely, 2^{21604918837139} is an apocalyptic number.

21604918837139 is a deficient number, since it is larger than the sum of its proper divisors (2296041311341).

21604918837139 is a wasteful number, since it uses less digits than its factorization.

21604918837139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27663148401.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 21604918837139 in words is "twenty-one trillion, six hundred four billion, nine hundred eighteen million, eight hundred thirty-seven thousand, one hundred thirty-nine".