21724285672 has 32 divisors (see below), whose sum is σ = 41867366400. Its totient is φ = 10560124224.

The previous prime is 21724285663. The next prime is 21724285733. The reversal of 21724285672 is 27658242712.

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, 349893 + ... + 407275.

It is an arithmetic number, because the mean of its divisors is an integer number (1308355200).

Almost surely, 2^21724285672 is an apocalyptic number.

It is an amenable number.

21724285672 is a deficient number, since it is larger than the sum of its proper divisors (20143080728).

21724285672 is a wasteful number, since it uses less digits than its factorization.

21724285672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58705 (or 58701 counting only the distinct ones).

The product of its digits is 752640, while the sum is 46.

The spelling of 21724285672 in words is "twenty-one billion, seven hundred twenty-four million, two hundred eighty-five thousand, six hundred seventy-two".