21723672 has 32 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 7224864.

The previous prime is 21723659. The next prime is 21723701. The reversal of 21723672 is 27632712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14829 + ... + 16227.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^21723672 is an apocalyptic number.

It is an amenable number.

21723672 is an abundant number, since it is smaller than the sum of its proper divisors (32708328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21723672 is a wasteful number, since it uses less digits than its factorization.

21723672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2051 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 21723672 is about 4660.8660139506. The cubic root of 21723672 is about 279.0258323225.

The spelling of 21723672 in words is "twenty-one million, seven hundred twenty-three thousand, six hundred seventy-two".