21222201233 has 2 divisors, whose sum is σ = 21222201234. Its totient is φ = 21222201232.

The previous prime is 21222201199. The next prime is 21222201239. The reversal of 21222201233 is 33210222212.

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., 19056974209 + 2165227024 = 138047^2 + 46532^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222201233 - 2¹⁴ = 21222184849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21222201239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100616 + 10611100617.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100617).

Almost surely, 2^21222201233 is an apocalyptic number.

It is an amenable number.

21222201233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222201233 is an equidigital number, since it uses as much as digits as its factorization.

21222201233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21222201233 its reverse (33210222212), we get a palindrome (54432423445).

The spelling of 21222201233 in words is "twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred thirty-three".