21716451913 has 8 divisors (see below), whose sum is σ = 23555201600. Its totient is φ = 19901738448.

The previous prime is 21716451863. The next prime is 21716451961. The reversal of 21716451913 is 31915461712.

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 21716451913 - 2⁹ = 21716451401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21716451973) 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, 6007173 + ... + 6010786.

It is an arithmetic number, because the mean of its divisors is an integer number (2944400200).

Almost surely, 2^21716451913 is an apocalyptic number.

It is an amenable number.

21716451913 is a deficient number, since it is larger than the sum of its proper divisors (1838749687).

21716451913 is a wasteful number, since it uses less digits than its factorization.

21716451913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018111.

The product of its digits is 45360, while the sum is 40.

The spelling of 21716451913 in words is "twenty-one billion, seven hundred sixteen million, four hundred fifty-one thousand, nine hundred thirteen".