2121125117 has 2 divisors, whose sum is σ = 2121125118. Its totient is φ = 2121125116.

The previous prime is 2121125101. The next prime is 2121125129. The reversal of 2121125117 is 7115211212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1412181241 + 708943876 = 37579^2 + 26626^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121125117 - 2⁴ = 2121125101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121125092 and 2121125101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121125177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060562558 + 1060562559.

It is an arithmetic number, because the mean of its divisors is an integer number (1060562559).

Almost surely, 2^2121125117 is an apocalyptic number.

It is an amenable number.

2121125117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121125117 is an equidigital number, since it uses as much as digits as its factorization.

2121125117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 23.

The square root of 2121125117 is about 46055.6741021125. The cubic root of 2121125117 is about 1284.8588755270.

Adding to 2121125117 its reverse (7115211212), we get a palindrome (9236336329).

The spelling of 2121125117 in words is "two billion, one hundred twenty-one million, one hundred twenty-five thousand, one hundred seventeen".