12212222200021 has 2 divisors, whose sum is σ = 12212222200022. Its totient is φ = 12212222200020.

The previous prime is 12212222199953. The next prime is 12212222200043. The reversal of 12212222200021 is 12000222221221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11672164767025 + 540057432996 = 3416455^2 + 734886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212222200021 - 2²⁷ = 12212087982293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212222200081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106111100010 + 6106111100011.

It is an arithmetic number, because the mean of its divisors is an integer number (6106111100011).

Almost surely, 2^{12212222200021} is an apocalyptic number.

It is an amenable number.

12212222200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212222200021 is an equidigital number, since it uses as much as digits as its factorization.

12212222200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 12212222200021 its reverse (12000222221221), we get a palindrome (24212444421242).

It can be divided in two parts, 1221222 and 2200021, that added together give a palindrome (3421243).

The spelling of 12212222200021 in words is "twelve trillion, two hundred twelve billion, two hundred twenty-two million, two hundred thousand, twenty-one".