1211401202129 has 2 divisors, whose sum is σ = 1211401202130. Its totient is φ = 1211401202128.

The previous prime is 1211401202111. The next prime is 1211401202213. The reversal of 1211401202129 is 9212021041121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869938617025 + 341462585104 = 932705^2 + 584348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211401202129 - 2²⁸ = 1211132766673 is a prime.

It is a super-3 number, since 3×1211401202129³ (a number of 37 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211401202098 and 1211401202107.

It is not a weakly prime, because it can be changed into another prime (1211401202329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605700601064 + 605700601065.

It is an arithmetic number, because the mean of its divisors is an integer number (605700601065).

Almost surely, 2^{1211401202129} is an apocalyptic number.

It is an amenable number.

1211401202129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211401202129 is an equidigital number, since it uses as much as digits as its factorization.

1211401202129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1211401202129 in words is "one trillion, two hundred eleven billion, four hundred one million, two hundred two thousand, one hundred twenty-nine".