22121101217 has 2 divisors, whose sum is σ = 22121101218. Its totient is φ = 22121101216.

The previous prime is 22121101187. The next prime is 22121101259. The reversal of 22121101217 is 71210112122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16259055121 + 5862046096 = 127511^2 + 76564^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121101217 - 2¹⁰ = 22121100193 is a prime.

It is not a weakly prime, because it can be changed into another prime (22121100217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060550608 + 11060550609.

It is an arithmetic number, because the mean of its divisors is an integer number (11060550609).

Almost surely, 2^22121101217 is an apocalyptic number.

It is an amenable number.

22121101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121101217 is an equidigital number, since it uses as much as digits as its factorization.

22121101217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 22121101217 its reverse (71210112122), we get a palindrome (93331213339).

The spelling of 22121101217 in words is "twenty-two billion, one hundred twenty-one million, one hundred one thousand, two hundred seventeen".