20222121217 has 2 divisors, whose sum is σ = 20222121218. Its totient is φ = 20222121216.

The previous prime is 20222121181. The next prime is 20222121223. The reversal of 20222121217 is 71212122202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16559571856 + 3662549361 = 128684^2 + 60519^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222121217 - 2⁷ = 20222121089 is a prime.

It is a super-2 number, since 2×20222121217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20222121317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111060608 + 10111060609.

It is an arithmetic number, because the mean of its divisors is an integer number (10111060609).

Almost surely, 2^20222121217 is an apocalyptic number.

It is an amenable number.

20222121217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222121217 is an equidigital number, since it uses as much as digits as its factorization.

20222121217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 20222121217 its reverse (71212122202), we get a palindrome (91434243419).

The spelling of 20222121217 in words is "twenty billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred seventeen".