21261162130117 has 16 divisors (see below), whose sum is σ = 26174044150912. Its totient is φ = 16817865537600.

The previous prime is 21261162130099. The next prime is 21261162130157. The reversal of 21261162130117 is 71103126116212.

It is a cyclic number.

It is not a de Polignac number, because 21261162130117 - 2⁷ = 21261162129989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261162130157) 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, 28468578 + ... + 29205859.

It is an arithmetic number, because the mean of its divisors is an integer number (1635877759432).

Almost surely, 2^{21261162130117} is an apocalyptic number.

It is an amenable number.

21261162130117 is a deficient number, since it is larger than the sum of its proper divisors (4912882020795).

21261162130117 is a wasteful number, since it uses less digits than its factorization.

21261162130117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57678508.

The product of its (nonzero) digits is 6048, while the sum is 34.

Adding to 21261162130117 its reverse (71103126116212), we get a palindrome (92364288246329).

The spelling of 21261162130117 in words is "twenty-one trillion, two hundred sixty-one billion, one hundred sixty-two million, one hundred thirty thousand, one hundred seventeen".