2129286121 has 2 divisors, whose sum is σ = 2129286122. Its totient is φ = 2129286120.

The previous prime is 2129286113. The next prime is 2129286149. The reversal of 2129286121 is 1216829212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044848400 + 84437721 = 45220^2 + 9189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129286121 - 2³ = 2129286113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2129286151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064643060 + 1064643061.

It is an arithmetic number, because the mean of its divisors is an integer number (1064643061).

Almost surely, 2^2129286121 is an apocalyptic number.

It is an amenable number.

2129286121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129286121 is an equidigital number, since it uses as much as digits as its factorization.

2129286121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 2129286121 is about 46144.1883773027. The cubic root of 2129286121 is about 1286.5045931843.

The spelling of 2129286121 in words is "two billion, one hundred twenty-nine million, two hundred eighty-six thousand, one hundred twenty-one".