22111121 has 2 divisors, whose sum is σ = 22111122. Its totient is φ = 22111120.

The previous prime is 22111109. The next prime is 22111127. The reversal of 22111121 is 12111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 1960000 = 4489^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111121 - 2²² = 17916817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22111127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055560 + 11055561.

It is an arithmetic number, because the mean of its divisors is an integer number (11055561).

Almost surely, 2^22111121 is an apocalyptic number.

It is an amenable number.

22111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111121 is an equidigital number, since it uses as much as digits as its factorization.

22111121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8, while the sum is 11.

The square root of 22111121 is about 4702.2463780623. The cubic root of 22111121 is about 280.6749067742.

Adding to 22111121 its reverse (12111122), we get a palindrome (34222243).

Subtracting from 22111121 its reverse (12111122), we obtain a palindrome (9999999).

The spelling of 22111121 in words is "twenty-two million, one hundred eleven thousand, one hundred twenty-one".