21557224496 has 10 divisors (see below), whose sum is σ = 41767122492. Its totient is φ = 10778612240.

The previous prime is 21557224453. The next prime is 21557224517. The reversal of 21557224496 is 69442275512.

It is a self number, because there is not a number n which added to its sum of digits gives 21557224496.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673663250 + ... + 673663281.

Almost surely, 2^21557224496 is an apocalyptic number.

It is an amenable number.

21557224496 is a deficient number, since it is larger than the sum of its proper divisors (20209897996).

21557224496 is a wasteful number, since it uses less digits than its factorization.

21557224496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347326539 (or 1347326533 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The spelling of 21557224496 in words is "twenty-one billion, five hundred fifty-seven million, two hundred twenty-four thousand, four hundred ninety-six".