21893568833 has 4 divisors (see below), whose sum is σ = 22020121428. Its totient is φ = 21767016240.

The previous prime is 21893568797. The next prime is 21893568839. The reversal of 21893568833 is 33886539812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13888151104 + 8005417729 = 117848^2 + 89473^2 .

It is a cyclic number.

It is not a de Polignac number, because 21893568833 - 2¹⁸ = 21893306689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21893568839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63276038 + ... + 63276383.

It is an arithmetic number, because the mean of its divisors is an integer number (5505030357).

Almost surely, 2^21893568833 is an apocalyptic number.

It is an amenable number.

21893568833 is a deficient number, since it is larger than the sum of its proper divisors (126552595).

21893568833 is a wasteful number, since it uses less digits than its factorization.

21893568833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126552594.

The product of its digits is 7464960, while the sum is 56.

The spelling of 21893568833 in words is "twenty-one billion, eight hundred ninety-three million, five hundred sixty-eight thousand, eight hundred thirty-three".