21604918837137 has 8 divisors (see below), whose sum is σ = 28806768582336. Its totient is φ = 14403174158352.

The previous prime is 21604918837121. The next prime is 21604918837153. The reversal of 21604918837137 is 73173881940612.

It is an interprime number because it is at equal distance from previous prime (21604918837121) and next prime (21604918837153).

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

It is not a de Polignac number, because 21604918837137 - 2⁴ = 21604918837121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21604918837157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25785538 + ... + 26610219.

It is an arithmetic number, because the mean of its divisors is an integer number (3600846072792).

Almost surely, 2^{21604918837137} is an apocalyptic number.

It is an amenable number.

21604918837137 is a deficient number, since it is larger than the sum of its proper divisors (7201849745199).

21604918837137 is a wasteful number, since it uses less digits than its factorization.

21604918837137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52533207.

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 21604918837137 in words is "twenty-one trillion, six hundred four billion, nine hundred eighteen million, eight hundred thirty-seven thousand, one hundred thirty-seven".