21552893668 has 12 divisors (see below), whose sum is σ = 37824415020. Its totient is φ = 10745917952.

The previous prime is 21552893651. The next prime is 21552893711. The reversal of 21552893668 is 86639825512.

It can be written as a sum of positive squares in 2 ways, for example, as 2876391424 + 18676502244 = 53632^2 + 136662^2 .

It is a super-2 number, since 2×21552893668² (a number of 21 digits) contains 22 as substring.

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, 7630633 + ... + 7633456.

It is an arithmetic number, because the mean of its divisors is an integer number (3152034585).

Almost surely, 2^21552893668 is an apocalyptic number.

It is an amenable number.

21552893668 is a deficient number, since it is larger than the sum of its proper divisors (16271521352).

21552893668 is a wasteful number, since it uses less digits than its factorization.

21552893668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15264446 (or 15264444 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 55.

The spelling of 21552893668 in words is "twenty-one billion, five hundred fifty-two million, eight hundred ninety-three thousand, six hundred sixty-eight".