21476668 has 12 divisors (see below), whose sum is σ = 37859472. Its totient is φ = 10659680.

The previous prime is 21476659. The next prime is 21476671. The reversal of 21476668 is 86667412.

It is a super-2 number, since 2×21476668² = 922494536764448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21476668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19048 + ... + 20143.

It is an arithmetic number, because the mean of its divisors is an integer number (3154956).

Almost surely, 2^21476668 is an apocalyptic number.

It is an amenable number.

21476668 is a deficient number, since it is larger than the sum of its proper divisors (16382804).

21476668 is a wasteful number, since it uses less digits than its factorization.

21476668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39332 (or 39330 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 21476668 is about 4634.2926105286. The cubic root of 21476668 is about 277.9642657173.

The spelling of 21476668 in words is "twenty-one million, four hundred seventy-six thousand, six hundred sixty-eight".