20222111001221 has 2 divisors, whose sum is σ = 20222111001222. Its totient is φ = 20222111001220.

The previous prime is 20222111001173. The next prime is 20222111001229. The reversal of 20222111001221 is 12210011122202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17459820465025 + 2762290536196 = 4178495^2 + 1662014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222111001221 - 2²² = 20222106806917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20222111001221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222111001229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111055500610 + 10111055500611.

It is an arithmetic number, because the mean of its divisors is an integer number (10111055500611).

Almost surely, 2^{20222111001221} is an apocalyptic number.

It is an amenable number.

20222111001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222111001221 is an equidigital number, since it uses as much as digits as its factorization.

20222111001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20222111001221 its reverse (12210011122202), we get a palindrome (32432122123423).

The spelling of 20222111001221 in words is "twenty trillion, two hundred twenty-two billion, one hundred eleven million, one thousand, two hundred twenty-one".