21839044 has 6 divisors (see below), whose sum is σ = 38218334. Its totient is φ = 10919520.

The previous prime is 21839023. The next prime is 21839053. The reversal of 21839044 is 44093812.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 2214144 = 4430^2 + 1488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21838997 and 21839015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2729877 + ... + 2729884.

Almost surely, 2^21839044 is an apocalyptic number.

It is an amenable number.

21839044 is a deficient number, since it is larger than the sum of its proper divisors (16379290).

21839044 is a wasteful number, since it uses less digits than its factorization.

21839044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459765 (or 5459763 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21839044 is about 4673.2262945421. The cubic root of 21839044 is about 279.5189188031.

The spelling of 21839044 in words is "twenty-one million, eight hundred thirty-nine thousand, forty-four".