21684148 has 12 divisors (see below), whose sum is σ = 38514112. Its totient is φ = 10680120.

The previous prime is 21684127. The next prime is 21684167. The reversal of 21684148 is 84148612.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 40188 + ... + 40723.

Almost surely, 2^21684148 is an apocalyptic number.

It is an amenable number.

21684148 is a deficient number, since it is larger than the sum of its proper divisors (16829964).

21684148 is a wasteful number, since it uses less digits than its factorization.

21684148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80982 (or 80980 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 21684148 is about 4656.6240990658. The cubic root of 21684148 is about 278.8565099353.

The spelling of 21684148 in words is "twenty-one million, six hundred eighty-four thousand, one hundred forty-eight".