21395168893 has 16 divisors (see below), whose sum is σ = 24953778304. Its totient is φ = 17965126080.

The previous prime is 21395168891. The next prime is 21395168903. The reversal of 21395168893 is 39886159312.

It is a cyclic number.

It is not a de Polignac number, because 21395168893 - 2¹ = 21395168891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395168891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41130 + ... + 210907.

It is an arithmetic number, because the mean of its divisors is an integer number (1559611144).

Almost surely, 2^21395168893 is an apocalyptic number.

It is an amenable number.

21395168893 is a deficient number, since it is larger than the sum of its proper divisors (3558609411).

21395168893 is a wasteful number, since it uses less digits than its factorization.

21395168893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252292.

The product of its digits is 2799360, while the sum is 55.

The spelling of 21395168893 in words is "twenty-one billion, three hundred ninety-five million, one hundred sixty-eight thousand, eight hundred ninety-three".