21012012211129 has 2 divisors, whose sum is σ = 21012012211130. Its totient is φ = 21012012211128.

The previous prime is 21012012211103. The next prime is 21012012211147. The reversal of 21012012211129 is 92111221021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18526180682025 + 2485831529104 = 4304205^2 + 1576652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012012211129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012012211189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506006105564 + 10506006105565.

It is an arithmetic number, because the mean of its divisors is an integer number (10506006105565).

Almost surely, 2^{21012012211129} is an apocalyptic number.

It is an amenable number.

21012012211129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012012211129 is an equidigital number, since it uses as much as digits as its factorization.

21012012211129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 21012012211129 in words is "twenty-one trillion, twelve billion, twelve million, two hundred eleven thousand, one hundred twenty-nine".