21610579507 has 4 divisors (see below), whose sum is σ = 23575177656. Its totient is φ = 19645981360.

The previous prime is 21610579483. The next prime is 21610579519. The reversal of 21610579507 is 70597501612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21610579507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21610579597) 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, 982299058 + ... + 982299079.

It is an arithmetic number, because the mean of its divisors is an integer number (5893794414).

Almost surely, 2^21610579507 is an apocalyptic number.

21610579507 is a deficient number, since it is larger than the sum of its proper divisors (1964598149).

21610579507 is a wasteful number, since it uses less digits than its factorization.

21610579507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964598148.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 21610579507 in words is "twenty-one billion, six hundred ten million, five hundred seventy-nine thousand, five hundred seven".