21712716224 has 56 divisors (see below), whose sum is σ = 43418881920. Its totient is φ = 10772745984.

The previous prime is 21712716199. The next prime is 21712716229. The reversal of 21712716224 is 42261721712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712716229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8959877 + ... + 8962299.

Almost surely, 2^21712716224 is an apocalyptic number.

It is an amenable number.

21712716224 is a deficient number, since it is larger than the sum of its proper divisors (21706165696).

21712716224 is a wasteful number, since it uses less digits than its factorization.

21712716224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457 (or 3447 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The spelling of 21712716224 in words is "twenty-one billion, seven hundred twelve million, seven hundred sixteen thousand, two hundred twenty-four".