21748044 has 24 divisors (see below), whose sum is σ = 50964480. Its totient is φ = 7218064.

The previous prime is 21748033. The next prime is 21748061. The reversal of 21748044 is 44084712.

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 7 ways as a sum of consecutive naturals, for example, 924 + ... + 6659.

It is an arithmetic number, because the mean of its divisors is an integer number (2123520).

Almost surely, 2^21748044 is an apocalyptic number.

It is an amenable number.

21748044 is an abundant number, since it is smaller than the sum of its proper divisors (29216436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21748044 is a wasteful number, since it uses less digits than its factorization.

21748044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7829 (or 7827 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 21748044 is about 4663.4798166176. The cubic root of 21748044 is about 279.1301405938.

The spelling of 21748044 in words is "twenty-one million, seven hundred forty-eight thousand, forty-four".