21313718057 has 8 divisors (see below), whose sum is σ = 22569290496. Its totient is φ = 20058348352.

The previous prime is 21313718051. The next prime is 21313718059. The reversal of 21313718057 is 75081731312.

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 21313718057 - 2²⁰ = 21312669481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313718057.

It is not an unprimeable number, because it can be changed into a prime (21313718051) 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, 201728 + ... + 288654.

It is an arithmetic number, because the mean of its divisors is an integer number (2821161312).

Almost surely, 2^21313718057 is an apocalyptic number.

It is an amenable number.

21313718057 is a deficient number, since it is larger than the sum of its proper divisors (1255572439).

21313718057 is a wasteful number, since it uses less digits than its factorization.

21313718057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101367.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 21313718057 in words is "twenty-one billion, three hundred thirteen million, seven hundred eighteen thousand, fifty-seven".