21717212460163 has 4 divisors (see below), whose sum is σ = 23691504502008. Its totient is φ = 19742920418320.

The previous prime is 21717212460149. The next prime is 21717212460179. The reversal of 21717212460163 is 36106421271712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21717212460163 - 2⁵ = 21717212460131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21717212469163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987146020906 + ... + 987146020927.

It is an arithmetic number, because the mean of its divisors is an integer number (5922876125502).

Almost surely, 2^{21717212460163} is an apocalyptic number.

21717212460163 is a deficient number, since it is larger than the sum of its proper divisors (1974292041845).

21717212460163 is a wasteful number, since it uses less digits than its factorization.

21717212460163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974292041844.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 21717212460163 in words is "twenty-one trillion, seven hundred seventeen billion, two hundred twelve million, four hundred sixty thousand, one hundred sixty-three".