2161404101 has 2 divisors, whose sum is σ = 2161404102. Its totient is φ = 2161404100.

The previous prime is 2161404067. The next prime is 2161404127. The reversal of 2161404101 is 1014041612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1735972225 + 425431876 = 41665^2 + 20626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161404101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161404151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080702050 + 1080702051.

It is an arithmetic number, because the mean of its divisors is an integer number (1080702051).

Almost surely, 2^2161404101 is an apocalyptic number.

It is an amenable number.

2161404101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161404101 is an equidigital number, since it uses as much as digits as its factorization.

2161404101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2161404101 is about 46490.9034220674. The cubic root of 2161404101 is about 1292.9408500067.

Adding to 2161404101 its reverse (1014041612), we get a palindrome (3175445713).

The spelling of 2161404101 in words is "two billion, one hundred sixty-one million, four hundred four thousand, one hundred one".