12222250721 has 2 divisors, whose sum is σ = 12222250722. Its totient is φ = 12222250720.

The previous prime is 12222250697. The next prime is 12222250723. The reversal of 12222250721 is 12705222221.

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., 12070098496 + 152152225 = 109864^2 + 12335^2 .

It is a cyclic number.

It is not a de Polignac number, because 12222250721 - 2²⁶ = 12155141857 is a prime.

Together with 12222250723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12222250723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6111125360 + 6111125361.

It is an arithmetic number, because the mean of its divisors is an integer number (6111125361).

Almost surely, 2^12222250721 is an apocalyptic number.

It is an amenable number.

12222250721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12222250721 is an equidigital number, since it uses as much as digits as its factorization.

12222250721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

Adding to 12222250721 its reverse (12705222221), we get a palindrome (24927472942).

The spelling of 12222250721 in words is "twelve billion, two hundred twenty-two million, two hundred fifty thousand, seven hundred twenty-one".