12123230221 has 2 divisors, whose sum is σ = 12123230222. Its totient is φ = 12123230220.

The previous prime is 12123230201. The next prime is 12123230291. The reversal of 12123230221 is 12203232121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6850872900 + 5272357321 = 82770^2 + 72611^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123230221 - 2¹³ = 12123222029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123230201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061615110 + 6061615111.

It is an arithmetic number, because the mean of its divisors is an integer number (6061615111).

Almost surely, 2^12123230221 is an apocalyptic number.

It is an amenable number.

12123230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123230221 is an equidigital number, since it uses as much as digits as its factorization.

12123230221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12123230221 its reverse (12203232121), we get a palindrome (24326462342).

The spelling of 12123230221 in words is "twelve billion, one hundred twenty-three million, two hundred thirty thousand, two hundred twenty-one".