21080859 has 8 divisors (see below), whose sum is σ = 28234752. Its totient is φ = 13990440.

The previous prime is 21080849. The next prime is 21080869. The reversal of 21080859 is 95808012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21080849) and next prime (21080869).

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

It is not a de Polignac number, because 21080859 - 2²⁰ = 20032283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21080849) 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, 15087 + ... + 16424.

It is an arithmetic number, because the mean of its divisors is an integer number (3529344).

Almost surely, 2^21080859 is an apocalyptic number.

21080859 is a deficient number, since it is larger than the sum of its proper divisors (7153893).

21080859 is a wasteful number, since it uses less digits than its factorization.

21080859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31737.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 21080859 is about 4591.3896589159. The cubic root of 21080859 is about 276.2460654763.

The spelling of 21080859 in words is "twenty-one million, eighty thousand, eight hundred fifty-nine".