21940444 has 6 divisors (see below), whose sum is σ = 38395784. Its totient is φ = 10970220.

The previous prime is 21940441. The next prime is 21940483. The reversal of 21940444 is 44404912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21940441) by changing a digit.

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 as a sum of consecutive naturals, namely, 2742552 + ... + 2742559.

Almost surely, 2^21940444 is an apocalyptic number.

It is an amenable number.

21940444 is a deficient number, since it is larger than the sum of its proper divisors (16455340).

21940444 is a wasteful number, since it uses less digits than its factorization.

21940444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485115 (or 5485113 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21940444 is about 4684.0627664454. The cubic root of 21940444 is about 279.9508587229.

The spelling of 21940444 in words is "twenty-one million, nine hundred forty thousand, four hundred forty-four".