21994072 has 16 divisors (see below), whose sum is σ = 43032240. Its totient is φ = 10518816.

The previous prime is 21994069. The next prime is 21994111. The reversal of 21994072 is 27049912.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 59583 + ... + 59950.

It is an arithmetic number, because the mean of its divisors is an integer number (2689515).

Almost surely, 2^21994072 is an apocalyptic number.

It is an amenable number.

21994072 is a deficient number, since it is larger than the sum of its proper divisors (21038168).

21994072 is a wasteful number, since it uses less digits than its factorization.

21994072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119562 (or 119558 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21994072 is about 4689.7837903255. The cubic root of 21994072 is about 280.1787633969.

The spelling of 21994072 in words is "twenty-one million, nine hundred ninety-four thousand, seventy-two".