22110212221 has 2 divisors, whose sum is σ = 22110212222. Its totient is φ = 22110212220.

The previous prime is 22110212213. The next prime is 22110212231. The reversal of 22110212221 is 12221201122.

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., 14644388196 + 7465824025 = 121014^2 + 86405^2 .

It is a cyclic number.

It is not a de Polignac number, because 22110212221 - 2³ = 22110212213 is a prime.

It is a super-2 number, since 2×22110212221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22110212195 and 22110212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22110212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055106110 + 11055106111.

It is an arithmetic number, because the mean of its divisors is an integer number (11055106111).

Almost surely, 2^22110212221 is an apocalyptic number.

It is an amenable number.

22110212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22110212221 is an equidigital number, since it uses as much as digits as its factorization.

22110212221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22110212221 its reverse (12221201122), we get a palindrome (34331413343).

The spelling of 22110212221 in words is "twenty-two billion, one hundred ten million, two hundred twelve thousand, two hundred twenty-one".