223209121 has 2 divisors, whose sum is σ = 223209122. Its totient is φ = 223209120.

The previous prime is 223209073. The next prime is 223209127. The reversal of 223209121 is 121902322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177848896 + 45360225 = 13336^2 + 6735^2 .

It is a cyclic number.

It is not a de Polignac number, because 223209121 - 2¹⁵ = 223176353 is a prime.

It is a super-3 number, since 3×223209121³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223209092 and 223209101.

It is not a weakly prime, because it can be changed into another prime (223209127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111604560 + 111604561.

It is an arithmetic number, because the mean of its divisors is an integer number (111604561).

Almost surely, 2^223209121 is an apocalyptic number.

It is an amenable number.

223209121 is a deficient number, since it is larger than the sum of its proper divisors (1).

223209121 is an equidigital number, since it uses as much as digits as its factorization.

223209121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 223209121 is about 14940.1847712804. The cubic root of 223209121 is about 606.6021972241.

The spelling of 223209121 in words is "two hundred twenty-three million, two hundred nine thousand, one hundred twenty-one".