21317605373 has 8 divisors (see below), whose sum is σ = 21762950400. Its totient is φ = 20876290960.

The previous prime is 21317605367. The next prime is 21317605403. The reversal of 21317605373 is 37350671312.

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 not a de Polignac number, because 21317605373 - 2²⁸ = 21049169917 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 (21317605303) 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, 996965 + ... + 1018122.

It is an arithmetic number, because the mean of its divisors is an integer number (2720368800).

Almost surely, 2^21317605373 is an apocalyptic number.

It is an amenable number.

21317605373 is a deficient number, since it is larger than the sum of its proper divisors (445345027).

21317605373 is a wasteful number, since it uses less digits than its factorization.

21317605373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015307.

The product of its (nonzero) digits is 79380, while the sum is 38.

The spelling of 21317605373 in words is "twenty-one billion, three hundred seventeen million, six hundred five thousand, three hundred seventy-three".