21544672 has 12 divisors (see below), whose sum is σ = 42416136. Its totient is φ = 10772320.

The previous prime is 21544669. The next prime is 21544673. The reversal of 21544672 is 27644512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336604 + ... + 336667.

It is an arithmetic number, because the mean of its divisors is an integer number (3534678).

Almost surely, 2^21544672 is an apocalyptic number.

It is an amenable number.

21544672 is a deficient number, since it is larger than the sum of its proper divisors (20871464).

21544672 is an equidigital number, since it uses as much as digits as its factorization.

21544672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673281 (or 673273 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 21544672 is about 4641.6238537822. The cubic root of 21544672 is about 278.2573398216.

The spelling of 21544672 in words is "twenty-one million, five hundred forty-four thousand, six hundred seventy-two".