21611172161113 has 2 divisors, whose sum is σ = 21611172161114. Its totient is φ = 21611172161112.

The previous prime is 21611172161099. The next prime is 21611172161153. The reversal of 21611172161113 is 31116127111612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19201810068169 + 2409362092944 = 4381987^2 + 1552212^2 .

It is a cyclic number.

It is not a de Polignac number, because 21611172161113 - 2⁵ = 21611172161081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21611172161153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805586080556 + 10805586080557.

It is an arithmetic number, because the mean of its divisors is an integer number (10805586080557).

Almost surely, 2^{21611172161113} is an apocalyptic number.

It is an amenable number.

21611172161113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611172161113 is an equidigital number, since it uses as much as digits as its factorization.

21611172161113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 34.

Adding to 21611172161113 its reverse (31116127111612), we get a palindrome (52727299272725).

The spelling of 21611172161113 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-two million, one hundred sixty-one thousand, one hundred thirteen".