21568649224 has 16 divisors (see below), whose sum is σ = 42820112700. Its totient is φ = 10149952512.

The previous prime is 21568649209. The next prime is 21568649237. The reversal of 21568649224 is 42294686512.

It can be written as a sum of positive squares in 2 ways, for example, as 20138448100 + 1430201124 = 141910^2 + 37818^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79296369 + ... + 79296640.

Almost surely, 2^21568649224 is an apocalyptic number.

It is an amenable number.

21568649224 is a deficient number, since it is larger than the sum of its proper divisors (21251463476).

21568649224 is a wasteful number, since it uses less digits than its factorization.

21568649224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158593032 (or 158593028 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The spelling of 21568649224 in words is "twenty-one billion, five hundred sixty-eight million, six hundred forty-nine thousand, two hundred twenty-four".