121223213 has 2 divisors, whose sum is σ = 121223214. Its totient is φ = 121223212.

The previous prime is 121223203. The next prime is 121223227. The reversal of 121223213 is 312322121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107702884 + 13520329 = 10378^2 + 3677^2 .

It is a cyclic number.

It is not a de Polignac number, because 121223213 - 2⁴ = 121223197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121223191 and 121223200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121223203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611606 + 60611607.

It is an arithmetic number, because the mean of its divisors is an integer number (60611607).

Almost surely, 2^121223213 is an apocalyptic number.

It is an amenable number.

121223213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121223213 is an equidigital number, since it uses as much as digits as its factorization.

121223213 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 121223213 is about 11010.1413705729. The cubic root of 121223213 is about 494.9126982724.

Adding to 121223213 its reverse (312322121), we get a palindrome (433545334).

The spelling of 121223213 in words is "one hundred twenty-one million, two hundred twenty-three thousand, two hundred thirteen".