11211220220129 has 2 divisors, whose sum is σ = 11211220220130. Its totient is φ = 11211220220128.

The previous prime is 11211220220029. The next prime is 11211220220143. The reversal of 11211220220129 is 92102202211211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9025337808400 + 2185882411729 = 3004220^2 + 1478473^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211220220129 - 2²⁰ = 11211219171553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211220220098 and 11211220220107.

It is not a weakly prime, because it can be changed into another prime (11211220220029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610110064 + 5605610110065.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610110065).

Almost surely, 2^{11211220220129} is an apocalyptic number.

It is an amenable number.

11211220220129 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211220220129 is an equidigital number, since it uses as much as digits as its factorization.

11211220220129 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 11211220220129 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-nine".