20222222221 has 2 divisors, whose sum is σ = 20222222222. Its totient is φ = 20222222220.

The previous prime is 20222222213. The next prime is 20222222233. The reversal of 20222222221 is 12222222202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18854036100 + 1368186121 = 137310^2 + 36989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222222221 - 2³ = 20222222213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222223221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111111110 + 10111111111.

It is an arithmetic number, because the mean of its divisors is an integer number (10111111111).

Almost surely, 2^20222222221 is an apocalyptic number.

It is an amenable number.

20222222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222222221 is an equidigital number, since it uses as much as digits as its factorization.

20222222221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

Subtracting from 20222222221 its sum of digits (19), we obtain a palindrome (20222222202).

Adding to 20222222221 its reverse (12222222202), we get a palindrome (32444444423).

The spelling of 20222222221 in words is "twenty billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".