222231121 has 6 divisors (see below), whose sum is σ = 258513810. Its totient is φ = 190483776.

The previous prime is 222231109. The next prime is 222231137. The reversal of 222231121 is 121132222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 177822225 + 44408896 = 13335^2 + 6664^2 .

It is not a de Polignac number, because 222231121 - 2⁹ = 222230609 is a prime.

It is a super-2 number, since 2×222231121² = 98773342281833282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222231095 and 222231104.

It is not an unprimeable number, because it can be changed into a prime (222234121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2267616 + ... + 2267713.

It is an arithmetic number, because the mean of its divisors is an integer number (43085635).

Almost surely, 2^222231121 is an apocalyptic number.

It is an amenable number.

222231121 is a deficient number, since it is larger than the sum of its proper divisors (36282689).

222231121 is an equidigital number, since it uses as much as digits as its factorization.

222231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535343 (or 4535336 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 222231121 is about 14907.4183210910. The cubic root of 222231121 is about 605.7149492456.

Adding to 222231121 its reverse (121132222), we get a palindrome (343363343).

The spelling of 222231121 in words is "two hundred twenty-two million, two hundred thirty-one thousand, one hundred twenty-one".