22111112100221 has 2 divisors, whose sum is σ = 22111112100222. Its totient is φ = 22111112100220.

The previous prime is 22111112100193. The next prime is 22111112100229. The reversal of 22111112100221 is 12200121111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19332606496996 + 2778505603225 = 4396886^2 + 1666885^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111112100221 - 2³⁴ = 22093932231037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22111112100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111112100229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055556050110 + 11055556050111.

It is an arithmetic number, because the mean of its divisors is an integer number (11055556050111).

Almost surely, 2^{22111112100221} is an apocalyptic number.

It is an amenable number.

22111112100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111112100221 is an equidigital number, since it uses as much as digits as its factorization.

22111112100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 22111112100221 its reverse (12200121111122), we get a palindrome (34311233211343).

The spelling of 22111112100221 in words is "twenty-two trillion, one hundred eleven billion, one hundred twelve million, one hundred thousand, two hundred twenty-one".