21446684 has 12 divisors (see below), whose sum is σ = 42893424. Its totient is φ = 9191424.

The previous prime is 21446657. The next prime is 21446693. The reversal of 21446684 is 48664412.

21446684 is an admirable number.

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, 382949 + ... + 383004.

It is an arithmetic number, because the mean of its divisors is an integer number (3574452).

Almost surely, 2^21446684 is an apocalyptic number.

It is an amenable number.

21446684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21446684 is a wasteful number, since it uses less digits than its factorization.

21446684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765964 (or 765962 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 21446684 is about 4631.0564669414. The cubic root of 21446684 is about 277.8348483390.

The spelling of 21446684 in words is "twenty-one million, four hundred forty-six thousand, six hundred eighty-four".