2123129 has 2 divisors, whose sum is σ = 2123130. Its totient is φ = 2123128.

The previous prime is 2123123. The next prime is 2123137. The reversal of 2123129 is 9213212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 273529 = 1360^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123129 - 2⁸ = 2122873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123129.

It is not a weakly prime, because it can be changed into another prime (2123123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061564 + 1061565.

It is an arithmetic number, because the mean of its divisors is an integer number (1061565).

2^2123129 is an apocalyptic number.

It is an amenable number.

2123129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123129 is an equidigital number, since it uses as much as digits as its factorization.

2123129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 2123129 is about 1457.0960846835. The cubic root of 2123129 is about 128.5263361565.

The spelling of 2123129 in words is "two million, one hundred twenty-three thousand, one hundred twenty-nine".