21046715 has 8 divisors (see below), whose sum is σ = 25310448. Its totient is φ = 16801120.

The previous prime is 21046709. The next prime is 21046733. The reversal of 21046715 is 51764012.

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

It is not a de Polignac number, because 21046715 - 2¹⁰ = 21045691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1832 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (3163806).

Almost surely, 2^21046715 is an apocalyptic number.

21046715 is a deficient number, since it is larger than the sum of its proper divisors (4263733).

21046715 is an equidigital number, since it uses as much as digits as its factorization.

21046715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21046715 is about 4587.6698878625. The cubic root of 21046715 is about 276.0968425476.

The spelling of 21046715 in words is "twenty-one million, forty-six thousand, seven hundred fifteen".