21493044 has 36 divisors (see below), whose sum is σ = 56085120. Its totient is φ = 6932880.

The previous prime is 21493033. The next prime is 21493057. The reversal of 21493044 is 44039412.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21492999 and 21493017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8514 + ... + 10745.

It is an arithmetic number, because the mean of its divisors is an integer number (1557920).

Almost surely, 2^21493044 is an apocalyptic number.

It is an amenable number.

21493044 is an abundant number, since it is smaller than the sum of its proper divisors (34592076).

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

21493044 is a wasteful number, since it uses less digits than its factorization.

21493044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19300 (or 19295 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21493044 is about 4636.0591022980. The cubic root of 21493044 is about 278.0348971943.

The spelling of 21493044 in words is "twenty-one million, four hundred ninety-three thousand, forty-four".