21647314 has 16 divisors (see below), whose sum is σ = 35544600. Its totient is φ = 9826560.

The previous prime is 21647299. The next prime is 21647321. The reversal of 21647314 is 41374612.

It can be written as a sum of positive squares in 4 ways, for example, as 4133089 + 17514225 = 2033^2 + 4185^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5239 + ... + 8410.

Almost surely, 2^21647314 is an apocalyptic number.

21647314 is a deficient number, since it is larger than the sum of its proper divisors (13897286).

21647314 is a wasteful number, since it uses less digits than its factorization.

21647314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13725.

The product of its digits is 4032, while the sum is 28.

The square root of 21647314 is about 4652.6674069828. The cubic root of 21647314 is about 278.6985262929.

The spelling of 21647314 in words is "twenty-one million, six hundred forty-seven thousand, three hundred fourteen".