21449644 has 12 divisors (see below), whose sum is σ = 38747968. Its totient is φ = 10378800.

The previous prime is 21449633. The next prime is 21449657. The reversal of 21449644 is 44694412.

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 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, 86367 + ... + 86614.

Almost surely, 2^21449644 is an apocalyptic number.

It is an amenable number.

21449644 is a deficient number, since it is larger than the sum of its proper divisors (17298324).

21449644 is a wasteful number, since it uses less digits than its factorization.

21449644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173016 (or 173014 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 21449644 is about 4631.3760374213. The cubic root of 21449644 is about 277.8476296983.

The spelling of 21449644 in words is "twenty-one million, four hundred forty-nine thousand, six hundred forty-four".