222240121 has 2 divisors, whose sum is σ = 222240122. Its totient is φ = 222240120.

The previous prime is 222240119. The next prime is 222240173. The reversal of 222240121 is 121042222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185504400 + 36735721 = 13620^2 + 6061^2 .

It is a cyclic number.

It is not a de Polignac number, because 222240121 - 2¹ = 222240119 is a prime.

Together with 222240119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 222240095 and 222240104.

It is not a weakly prime, because it can be changed into another prime (222240521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111120060 + 111120061.

It is an arithmetic number, because the mean of its divisors is an integer number (111120061).

Almost surely, 2^222240121 is an apocalyptic number.

It is an amenable number.

222240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222240121 is an equidigital number, since it uses as much as digits as its factorization.

222240121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 222240121 is about 14907.7201811679. The cubic root of 222240121 is about 605.7231259596.

Adding to 222240121 its reverse (121042222), we get a palindrome (343282343).

The spelling of 222240121 in words is "two hundred twenty-two million, two hundred forty thousand, one hundred twenty-one".