121233221 has 2 divisors, whose sum is σ = 121233222. Its totient is φ = 121233220.

The previous prime is 121233199. The next prime is 121233227. The reversal of 121233221 is 122332121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70324996 + 50908225 = 8386^2 + 7135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121233221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121233221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121233227) 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 as a sum of consecutive naturals, namely, 60616610 + 60616611.

It is an arithmetic number, because the mean of its divisors is an integer number (60616611).

Almost surely, 2^121233221 is an apocalyptic number.

It is an amenable number.

121233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121233221 is an equidigital number, since it uses as much as digits as its factorization.

121233221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 121233221 is about 11010.5958512698. The cubic root of 121233221 is about 494.9263176386.

Adding to 121233221 its reverse (122332121), we get a palindrome (243565342).

The spelling of 121233221 in words is "one hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".