21725776 has 20 divisors (see below), whose sum is σ = 42240352. Its totient is φ = 10825056.

The previous prime is 21725773. The next prime is 21725783. The reversal of 21725776 is 67752712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725773) 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, 2701 + ... + 7123.

Almost surely, 2^21725776 is an apocalyptic number.

It is an amenable number.

21725776 is a deficient number, since it is larger than the sum of its proper divisors (20514576).

21725776 is a wasteful number, since it uses less digits than its factorization.

21725776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738 (or 4732 counting only the distinct ones).

The product of its digits is 41160, while the sum is 37.

The square root of 21725776 is about 4661.0917176129. The cubic root of 21725776 is about 279.0348401827.

The spelling of 21725776 in words is "twenty-one million, seven hundred twenty-five thousand, seven hundred seventy-six".