21715466 has 8 divisors (see below), whose sum is σ = 32939460. Its totient is φ = 10735648.

The previous prime is 21715433. The next prime is 21715471. The reversal of 21715466 is 66451712.

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 748225 = 4579^2 + 865^2 .

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

It is a super-2 number, since 2×21715466² = 943122927194312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60821 + ... + 61176.

Almost surely, 2^21715466 is an apocalyptic number.

21715466 is a deficient number, since it is larger than the sum of its proper divisors (11223994).

21715466 is a wasteful number, since it uses less digits than its factorization.

21715466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122088.

The product of its digits is 10080, while the sum is 32.

The square root of 21715466 is about 4659.9856222954. The cubic root of 21715466 is about 278.9906943964.

The spelling of 21715466 in words is "twenty-one million, seven hundred fifteen thousand, four hundred sixty-six".