21519168959 has 8 divisors (see below), whose sum is σ = 21643922160. Its totient is φ = 21394466496.

The previous prime is 21519168917. The next prime is 21519169027. The reversal of 21519168959 is 95986191512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21519168959 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 (21519168059) 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, 1135667 + ... + 1154459.

It is an arithmetic number, because the mean of its divisors is an integer number (2705490270).

Almost surely, 2^21519168959 is an apocalyptic number.

21519168959 is a deficient number, since it is larger than the sum of its proper divisors (124753201).

21519168959 is a wasteful number, since it uses less digits than its factorization.

21519168959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25369.

The product of its digits is 1749600, while the sum is 56.

The spelling of 21519168959 in words is "twenty-one billion, five hundred nineteen million, one hundred sixty-eight thousand, nine hundred fifty-nine".