21694744 has 16 divisors (see below), whose sum is σ = 40891320. Its totient is φ = 10790400.

The previous prime is 21694741. The next prime is 21694759. The reversal of 21694744 is 44749612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5482 + ... + 8569.

Almost surely, 2^21694744 is an apocalyptic number.

It is an amenable number.

21694744 is a deficient number, since it is larger than the sum of its proper divisors (19196576).

21694744 is a wasteful number, since it uses less digits than its factorization.

21694744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250 (or 14246 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 21694744 is about 4657.7616942046. The cubic root of 21694744 is about 278.9019237929.

The spelling of 21694744 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred forty-four".