21294444 has 24 divisors (see below), whose sum is σ = 49835520. Its totient is φ = 7076944.

The previous prime is 21294419. The next prime is 21294451. The reversal of 21294444 is 44449212.

It is a congruent number.

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, 1837 + ... + 6779.

It is an arithmetic number, because the mean of its divisors is an integer number (2076480).

Almost surely, 2^21294444 is an apocalyptic number.

It is an amenable number.

21294444 is an abundant number, since it is smaller than the sum of its proper divisors (28541076).

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

21294444 is a wasteful number, since it uses less digits than its factorization.

21294444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309 (or 5307 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21294444 is about 4614.5903393476. The cubic root of 21294444 is about 277.1758799958.

The spelling of 21294444 in words is "twenty-one million, two hundred ninety-four thousand, four hundred forty-four".