221112361 has 2 divisors, whose sum is σ = 221112362. Its totient is φ = 221112360.

The previous prime is 221112349. The next prime is 221112377. The reversal of 221112361 is 163211122.

221112361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194435136 + 26677225 = 13944^2 + 5165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112361 is a prime.

It is not a weakly prime, because it can be changed into another prime (221112391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556180 + 110556181.

It is an arithmetic number, because the mean of its divisors is an integer number (110556181).

Almost surely, 2^221112361 is an apocalyptic number.

It is an amenable number.

221112361 is a deficient number, since it is larger than the sum of its proper divisors (1).

221112361 is an equidigital number, since it uses as much as digits as its factorization.

221112361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 221112361 is about 14869.8473764864. The cubic root of 221112361 is about 604.6968050270.

Adding to 221112361 its reverse (163211122), we get a palindrome (384323483).

The spelling of 221112361 in words is "two hundred twenty-one million, one hundred twelve thousand, three hundred sixty-one".