21149344 has 12 divisors (see below), whose sum is σ = 41637834. Its totient is φ = 10574656.

The previous prime is 21149333. The next prime is 21149353. The reversal of 21149344 is 44394112.

It can be written as a sum of positive squares in only one way, i.e., 17539344 + 3610000 = 4188^2 + 1900^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330427 + ... + 330490.

Almost surely, 2^21149344 is an apocalyptic number.

It is an amenable number.

21149344 is a deficient number, since it is larger than the sum of its proper divisors (20488490).

21149344 is an equidigital number, since it uses as much as digits as its factorization.

21149344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660927 (or 660919 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 21149344 is about 4598.8415932711. The cubic root of 21149344 is about 276.5448872927.

The spelling of 21149344 in words is "twenty-one million, one hundred forty-nine thousand, three hundred forty-four".