12154321 has 2 divisors, whose sum is σ = 12154322. Its totient is φ = 12154320.

The previous prime is 12154313. The next prime is 12154339. The reversal of 12154321 is 12345121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 1500625 = 3264^2 + 1225^2 .

It is an emirp because it is prime and its reverse (12345121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12154321 - 2³ = 12154313 is a prime.

It is not a weakly prime, because it can be changed into another prime (12152321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077160 + 6077161.

It is an arithmetic number, because the mean of its divisors is an integer number (6077161).

Almost surely, 2^12154321 is an apocalyptic number.

It is an amenable number.

12154321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154321 is an equidigital number, since it uses as much as digits as its factorization.

12154321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 12154321 is about 3486.3047772678. The cubic root of 12154321 is about 229.9200793527.

Adding to 12154321 its reverse (12345121), we get a palindrome (24499442).

The spelling of 12154321 in words is "twelve million, one hundred fifty-four thousand, three hundred twenty-one".