111012221 has 2 divisors, whose sum is σ = 111012222. Its totient is φ = 111012220.

The previous prime is 111012199. The next prime is 111012241. The reversal of 111012221 is 122210111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 39000025 = 8486^2 + 6245^2 .

It is an emirp because it is prime and its reverse (122210111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111012221 - 2¹⁸ = 110750077 is a prime.

It is a super-2 number, since 2×111012221² = 24647426422705682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506110 + 55506111.

It is an arithmetic number, because the mean of its divisors is an integer number (55506111).

Almost surely, 2^111012221 is an apocalyptic number.

It is an amenable number.

111012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012221 is an equidigital number, since it uses as much as digits as its factorization.

111012221 is an evil number, because the sum of its binary digits is even.

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

The square root of 111012221 is about 10536.2337198830. The cubic root of 111012221 is about 480.6071902156.

Adding to 111012221 its reverse (122210111), we get a palindrome (233222332).

It can be divided in two parts, 1110 and 12221, that added together give a palindrome (13331).

The spelling of 111012221 in words is "one hundred eleven million, twelve thousand, two hundred twenty-one".