21610106879 has 4 divisors (see below), whose sum is σ = 21832891584. Its totient is φ = 21387322176.

The previous prime is 21610106809. The next prime is 21610106887. The reversal of 21610106879 is 97860101612.

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

It is a cyclic number.

It is not a de Polignac number, because 21610106879 - 2²⁴ = 21593329663 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 (21610106809) 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, 111392207 + ... + 111392400.

It is an arithmetic number, because the mean of its divisors is an integer number (5458222896).

Almost surely, 2^21610106879 is an apocalyptic number.

21610106879 is a deficient number, since it is larger than the sum of its proper divisors (222784705).

21610106879 is an equidigital number, since it uses as much as digits as its factorization.

21610106879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222784704.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 21610106879 in words is "twenty-one billion, six hundred ten million, one hundred six thousand, eight hundred seventy-nine".