21476684 has 12 divisors (see below), whose sum is σ = 37754304. Its totient is φ = 10689744.

The previous prime is 21476671. The next prime is 21476699. The reversal of 21476684 is 48667412.

It is a super-2 number, since 2×21476684² = 922495911271712, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 11147 + ... + 12930.

It is an arithmetic number, because the mean of its divisors is an integer number (3146192).

Almost surely, 2^21476684 is an apocalyptic number.

It is an amenable number.

21476684 is a deficient number, since it is larger than the sum of its proper divisors (16277620).

21476684 is a wasteful number, since it uses less digits than its factorization.

21476684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24304 (or 24302 counting only the distinct ones).

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

The square root of 21476684 is about 4634.2943367896. The cubic root of 21476684 is about 277.9643347445.

The spelling of 21476684 in words is "twenty-one million, four hundred seventy-six thousand, six hundred eighty-four".