21474668 has 12 divisors (see below), whose sum is σ = 37690800. Its totient is φ = 10705872.

The previous prime is 21474667. The next prime is 21474683. The reversal of 21474668 is 86647412.

It is a super-2 number, since 2×21474668² = 922322731420448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21474667) 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, 6296 + ... + 9087.

It is an arithmetic number, because the mean of its divisors is an integer number (3140900).

Almost surely, 2^21474668 is an apocalyptic number.

It is an amenable number.

21474668 is a deficient number, since it is larger than the sum of its proper divisors (16216132).

21474668 is a wasteful number, since it uses less digits than its factorization.

21474668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15736 (or 15734 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 21474668 is about 4634.0768228418. The cubic root of 21474668 is about 277.9556370388.

The spelling of 21474668 in words is "twenty-one million, four hundred seventy-four thousand, six hundred sixty-eight".