21474817 has 16 divisors (see below), whose sum is σ = 26998272. Its totient is φ = 16626240.

The previous prime is 21474799. The next prime is 21474821. The reversal of 21474817 is 71847412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21474817 is a prime.

It is a super-2 number, since 2×21474817² = 922335530366978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21474217) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1767 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^21474817 is an apocalyptic number.

It is an amenable number.

21474817 is a deficient number, since it is larger than the sum of its proper divisors (5523455).

21474817 is a wasteful number, since it uses less digits than its factorization.

21474817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088.

The product of its digits is 12544, while the sum is 34.

The square root of 21474817 is about 4634.0928993709. The cubic root of 21474817 is about 277.9562798938.

The spelling of 21474817 in words is "twenty-one million, four hundred seventy-four thousand, eight hundred seventeen".