2100111161 has 2 divisors, whose sum is σ = 2100111162. Its totient is φ = 2100111160.

The previous prime is 2100111137. The next prime is 2100111193. The reversal of 2100111161 is 1611110012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2028961936 + 71149225 = 45044^2 + 8435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100111161 - 2²⁶ = 2033002297 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100111361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050055580 + 1050055581.

It is an arithmetic number, because the mean of its divisors is an integer number (1050055581).

Almost surely, 2^2100111161 is an apocalyptic number.

It is an amenable number.

2100111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100111161 is an equidigital number, since it uses as much as digits as its factorization.

2100111161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

The square root of 2100111161 is about 45826.9697994532. The cubic root of 2100111161 is about 1280.6017599000.

Adding to 2100111161 its reverse (1611110012), we get a palindrome (3711221173).

The spelling of 2100111161 in words is "two billion, one hundred million, one hundred eleven thousand, one hundred sixty-one".