21473715 has 8 divisors (see below), whose sum is σ = 34357968. Its totient is φ = 11452640.

The previous prime is 21473707. The next prime is 21473719. The reversal of 21473715 is 51737412.

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

It is not a de Polignac number, because 21473715 - 2³ = 21473707 is a prime.

It is a super-2 number, since 2×21473715² = 922240871802450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473719) 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, 715776 + ... + 715805.

It is an arithmetic number, because the mean of its divisors is an integer number (4294746).

Almost surely, 2^21473715 is an apocalyptic number.

21473715 is a deficient number, since it is larger than the sum of its proper divisors (12884253).

21473715 is a wasteful number, since it uses less digits than its factorization.

21473715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431589.

The product of its digits is 5880, while the sum is 30.

The square root of 21473715 is about 4633.9739964743. The cubic root of 21473715 is about 277.9515252850.

The spelling of 21473715 in words is "twenty-one million, four hundred seventy-three thousand, seven hundred fifteen".