212100021112121 has 2 divisors, whose sum is σ = 212100021112122. Its totient is φ = 212100021112120.

The previous prime is 212100021112061. The next prime is 212100021112163. The reversal of 212100021112121 is 121211120001212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208532776760896 + 3567244351225 = 14440664^2 + 1888715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100021112121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212100021112121.

It is not a weakly prime, because it can be changed into another prime (212100021112171) 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, 106050010556060 + 106050010556061.

It is an arithmetic number, because the mean of its divisors is an integer number (106050010556061).

Almost surely, 2^{212100021112121} is an apocalyptic number.

It is an amenable number.

212100021112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100021112121 is an equidigital number, since it uses as much as digits as its factorization.

212100021112121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212100021112121 its reverse (121211120001212), we get a palindrome (333311141113333).

The spelling of 212100021112121 in words is "two hundred twelve trillion, one hundred billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".