21008760879 has 8 divisors (see below), whose sum is σ = 28017061120. Its totient is φ = 14003150616.

The previous prime is 21008760859. The next prime is 21008760889. The reversal of 21008760879 is 97806780012.

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

It is not a de Polignac number, because 21008760879 - 2⁸ = 21008760623 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 (21008760859) 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, 654199 + ... + 685560.

It is an arithmetic number, because the mean of its divisors is an integer number (3502132640).

Almost surely, 2^21008760879 is an apocalyptic number.

21008760879 is a deficient number, since it is larger than the sum of its proper divisors (7008300241).

21008760879 is a wasteful number, since it uses less digits than its factorization.

21008760879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344989.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 21008760879 in words is "twenty-one billion, eight million, seven hundred sixty thousand, eight hundred seventy-nine".