21716474 has 8 divisors (see below), whose sum is σ = 35080500. Its totient is φ = 10022976.

The previous prime is 21716441. The next prime is 21716477. The reversal of 21716474 is 47461712.

It can be written as a sum of positive squares in 2 ways, for example, as 19298449 + 2418025 = 4393^2 + 1555^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21716474.

It is not an unprimeable number, because it can be changed into a prime (21716477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417599 + ... + 417650.

Almost surely, 2^21716474 is an apocalyptic number.

21716474 is a deficient number, since it is larger than the sum of its proper divisors (13364026).

21716474 is a wasteful number, since it uses less digits than its factorization.

21716474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835264.

The product of its digits is 9408, while the sum is 32.

The square root of 21716474 is about 4660.0937758805. The cubic root of 21716474 is about 278.9950111088.

The spelling of 21716474 in words is "twenty-one million, seven hundred sixteen thousand, four hundred seventy-four".