1222121129 has 2 divisors, whose sum is σ = 1222121130. Its totient is φ = 1222121128.

The previous prime is 1222121111. The next prime is 1222121141. The reversal of 1222121129 is 9211212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836077225 + 386043904 = 28915^2 + 19648^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222121129 - 2²⁴ = 1205343913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1222121149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611060564 + 611060565.

It is an arithmetic number, because the mean of its divisors is an integer number (611060565).

Almost surely, 2^1222121129 is an apocalyptic number.

It is an amenable number.

1222121129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222121129 is an equidigital number, since it uses as much as digits as its factorization.

1222121129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 1222121129 is about 34958.8490800255. The cubic root of 1222121129 is about 1069.1486310058.

The spelling of 1222121129 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-nine".