20012222201221 has 2 divisors, whose sum is σ = 20012222201222. Its totient is φ = 20012222201220.

The previous prime is 20012222201219. The next prime is 20012222201227. The reversal of 20012222201221 is 12210222221002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10556683301025 + 9455538900196 = 3249105^2 + 3074986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012222201221 - 2¹ = 20012222201219 is a prime.

It is a super-2 number, since 2×20012222201221² (a number of 27 digits) contains 22 as substring.

Together with 20012222201219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012222201227) 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, 10006111100610 + 10006111100611.

It is an arithmetic number, because the mean of its divisors is an integer number (10006111100611).

Almost surely, 2^{20012222201221} is an apocalyptic number.

It is an amenable number.

20012222201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012222201221 is an equidigital number, since it uses as much as digits as its factorization.

20012222201221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20012222201221 its reverse (12210222221002), we get a palindrome (32222444422223).

The spelling of 20012222201221 in words is "twenty trillion, twelve billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".