21611172161117 has 32 divisors (see below), whose sum is σ = 28363670400000. Its totient is φ = 15952565865600.

The previous prime is 21611172161113. The next prime is 21611172161153. The reversal of 21611172161117 is 71116127111612.

It is not a de Polignac number, because 21611172161117 - 2² = 21611172161113 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 (21611172161113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23317742 + ... + 24226832.

It is an arithmetic number, because the mean of its divisors is an integer number (886364700000).

Almost surely, 2^{21611172161117} is an apocalyptic number.

It is an amenable number.

21611172161117 is a deficient number, since it is larger than the sum of its proper divisors (6752498238883).

21611172161117 is a wasteful number, since it uses less digits than its factorization.

21611172161117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925377.

The product of its digits is 7056, while the sum is 38.

Adding to 21611172161117 its reverse (71116127111612), we get a palindrome (92727299272729).

It can be divided in two parts, 2161117 and 2161117, that added together give a palindrome (4322234).

The spelling of 21611172161117 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-two million, one hundred sixty-one thousand, one hundred seventeen".