21017113093 has 16 divisors (see below), whose sum is σ = 22827006720. Its totient is φ = 19286332416.

The previous prime is 21017113049. The next prime is 21017113111. The reversal of 21017113093 is 39031171012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21017113093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21017113043) 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 15 ways as a sum of consecutive naturals, for example, 34696 + ... + 207937.

It is an arithmetic number, because the mean of its divisors is an integer number (1426687920).

Almost surely, 2^21017113093 is an apocalyptic number.

It is an amenable number.

21017113093 is a deficient number, since it is larger than the sum of its proper divisors (1809893627).

21017113093 is a wasteful number, since it uses less digits than its factorization.

21017113093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242796.

The product of its (nonzero) digits is 1134, while the sum is 28.

The spelling of 21017113093 in words is "twenty-one billion, seventeen million, one hundred thirteen thousand, ninety-three".