21654944 has 12 divisors (see below), whose sum is σ = 42633234. Its totient is φ = 10827456.

The previous prime is 21654943. The next prime is 21654989. The reversal of 21654944 is 44945612.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 384400 = 4612^2 + 620^2 .

It is not an unprimeable number, because it can be changed into a prime (21654943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338327 + ... + 338390.

Almost surely, 2^21654944 is an apocalyptic number.

It is an amenable number.

21654944 is a deficient number, since it is larger than the sum of its proper divisors (20978290).

21654944 is an equidigital number, since it uses as much as digits as its factorization.

21654944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676727 (or 676719 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21654944 is about 4653.4872944922. The cubic root of 21654944 is about 278.7312666129.

The spelling of 21654944 in words is "twenty-one million, six hundred fifty-four thousand, nine hundred forty-four".