21719792 has 20 divisors (see below), whose sum is σ = 42712296. Its totient is φ = 10697280.

The previous prime is 21719767. The next prime is 21719801. The reversal of 21719792 is 29791712.

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, 9059 + ... + 11202.

Almost surely, 2^21719792 is an apocalyptic number.

It is an amenable number.

21719792 is a deficient number, since it is larger than the sum of its proper divisors (20992504).

21719792 is a wasteful number, since it uses less digits than its factorization.

21719792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20336 (or 20330 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 21719792 is about 4660.4497637031. The cubic root of 21719792 is about 279.0092193440.

The spelling of 21719792 in words is "twenty-one million, seven hundred nineteen thousand, seven hundred ninety-two".