221222111101 has 2 divisors, whose sum is σ = 221222111102. Its totient is φ = 221222111100.

The previous prime is 221222111093. The next prime is 221222111107. The reversal of 221222111101 is 101111222122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115549005625 + 105673105476 = 339925^2 + 325074^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222111101 - 2³ = 221222111093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222111107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611055550 + 110611055551.

It is an arithmetic number, because the mean of its divisors is an integer number (110611055551).

Almost surely, 2^221222111101 is an apocalyptic number.

It is an amenable number.

221222111101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222111101 is an equidigital number, since it uses as much as digits as its factorization.

221222111101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221222111101 its reverse (101111222122), we get a palindrome (322333333223).

The spelling of 221222111101 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred one".