21974044 has 6 divisors (see below), whose sum is σ = 38454584. Its totient is φ = 10987020.

The previous prime is 21974033. The next prime is 21974053. The reversal of 21974044 is 44047912.

It is a junction number, because it is equal to n+sod(n) for n = 21973997 and 21974015.

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, 2746752 + ... + 2746759.

Almost surely, 2^21974044 is an apocalyptic number.

It is an amenable number.

21974044 is a deficient number, since it is larger than the sum of its proper divisors (16480540).

21974044 is a wasteful number, since it uses less digits than its factorization.

21974044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493515 (or 5493513 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21974044 is about 4687.6480243295. The cubic root of 21974044 is about 280.0936931349.

It can be divided in two parts, 2197 and 4044, that added together give a square (6241 = 79²).

The spelling of 21974044 in words is "twenty-one million, nine hundred seventy-four thousand, forty-four".