21844616 has 8 divisors (see below), whose sum is σ = 40958670. Its totient is φ = 10922304.

The previous prime is 21844607. The next prime is 21844621. The reversal of 21844616 is 61644812.

It can be written as a sum of positive squares in only one way, i.e., 21659716 + 184900 = 4654^2 + 430^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365281 + ... + 1365296.

Almost surely, 2^21844616 is an apocalyptic number.

It is an amenable number.

21844616 is a deficient number, since it is larger than the sum of its proper divisors (19114054).

21844616 is a wasteful number, since it uses less digits than its factorization.

21844616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730583 (or 2730579 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21844616 is about 4673.8224185350. The cubic root of 21844616 is about 279.5426888755.

The spelling of 21844616 in words is "twenty-one million, eight hundred forty-four thousand, six hundred sixteen".