123219221 has 2 divisors, whose sum is σ = 123219222. Its totient is φ = 123219220.

The previous prime is 123219193. The next prime is 123219241. The reversal of 123219221 is 122912321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122434225 + 784996 = 11065^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 123219221 - 2⁶ = 123219157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123219241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61609610 + 61609611.

It is an arithmetic number, because the mean of its divisors is an integer number (61609611).

Almost surely, 2^123219221 is an apocalyptic number.

It is an amenable number.

123219221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123219221 is an equidigital number, since it uses as much as digits as its factorization.

123219221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 123219221 is about 11100.4153525893. The cubic root of 123219221 is about 497.6142626196.

The spelling of 123219221 in words is "one hundred twenty-three million, two hundred nineteen thousand, two hundred twenty-one".