21626684 has 6 divisors (see below), whose sum is σ = 37846704. Its totient is φ = 10813340.

The previous prime is 21626653. The next prime is 21626719. The reversal of 21626684 is 48662612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703332 + ... + 2703339.

It is an arithmetic number, because the mean of its divisors is an integer number (6307784).

Almost surely, 2^21626684 is an apocalyptic number.

It is an amenable number.

21626684 is a deficient number, since it is larger than the sum of its proper divisors (16220020).

21626684 is a wasteful number, since it uses less digits than its factorization.

21626684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406675 (or 5406673 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 21626684 is about 4650.4498707114. The cubic root of 21626684 is about 278.6099644507.

The spelling of 21626684 in words is "twenty-one million, six hundred twenty-six thousand, six hundred eighty-four".