1230123221 has 2 divisors, whose sum is σ = 1230123222. Its totient is φ = 1230123220.

The previous prime is 1230123211. The next prime is 1230123227. The reversal of 1230123221 is 1223210321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1148871025 + 81252196 = 33895^2 + 9014^2 .

It is an emirp because it is prime and its reverse (1223210321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1230123221 - 2⁶ = 1230123157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1230123221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230123227) 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, 615061610 + 615061611.

It is an arithmetic number, because the mean of its divisors is an integer number (615061611).

Almost surely, 2^1230123221 is an apocalyptic number.

It is an amenable number.

1230123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230123221 is an equidigital number, since it uses as much as digits as its factorization.

1230123221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1230123221 is about 35073.1125080167. The cubic root of 1230123221 is about 1071.4770473754.

Adding to 1230123221 its reverse (1223210321), we get a palindrome (2453333542).

The spelling of 1230123221 in words is "one billion, two hundred thirty million, one hundred twenty-three thousand, two hundred twenty-one".