111122322221 has 2 divisors, whose sum is σ = 111122322222. Its totient is φ = 111122322220.

The previous prime is 111122322203. The next prime is 111122322251. The reversal of 111122322221 is 122223221111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56513175625 + 54609146596 = 237725^2 + 233686^2 .

It is a cyclic number.

It is not a de Polignac number, because 111122322221 - 2²² = 111118127917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111122322193 and 111122322202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111122322251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561161110 + 55561161111.

It is an arithmetic number, because the mean of its divisors is an integer number (55561161111).

Almost surely, 2^111122322221 is an apocalyptic number.

It is an amenable number.

111122322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111122322221 is an equidigital number, since it uses as much as digits as its factorization.

111122322221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

Adding to 111122322221 its reverse (122223221111), we get a palindrome (233345543332).

The spelling of 111122322221 in words is "one hundred eleven billion, one hundred twenty-two million, three hundred twenty-two thousand, two hundred twenty-one".