20222211221 has 2 divisors, whose sum is σ = 20222211222. Its totient is φ = 20222211220.

The previous prime is 20222211187. The next prime is 20222211223. The reversal of 20222211221 is 12211222202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16254975025 + 3967236196 = 127495^2 + 62986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20222211221 is a prime.

It is a Sophie Germain prime.

Together with 20222211223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20222211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222211223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111105610 + 10111105611.

It is an arithmetic number, because the mean of its divisors is an integer number (10111105611).

Almost surely, 2^20222211221 is an apocalyptic number.

It is an amenable number.

20222211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222211221 is an equidigital number, since it uses as much as digits as its factorization.

20222211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20222211221 its reverse (12211222202), we get a palindrome (32433433423).

The spelling of 20222211221 in words is "twenty billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".