21023552168 has 16 divisors (see below), whose sum is σ = 39605984160. Its totient is φ = 10461956400.

The previous prime is 21023552167. The next prime is 21023552177. The reversal of 21023552168 is 86125532012.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21023552167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6225668 + ... + 6229043.

It is an arithmetic number, because the mean of its divisors is an integer number (2475374010).

Almost surely, 2^21023552168 is an apocalyptic number.

It is an amenable number.

21023552168 is a deficient number, since it is larger than the sum of its proper divisors (18582431992).

21023552168 is a wasteful number, since it uses less digits than its factorization.

21023552168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12454928 (or 12454924 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21023552168 in words is "twenty-one billion, twenty-three million, five hundred fifty-two thousand, one hundred sixty-eight".