121544321 has 2 divisors, whose sum is σ = 121544322. Its totient is φ = 121544320.

The previous prime is 121544299. The next prime is 121544327. The reversal of 121544321 is 123445121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93876721 + 27667600 = 9689^2 + 5260^2 .

It is an emirp because it is prime and its reverse (123445121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121544321 - 2¹⁴ = 121527937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121544327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60772160 + 60772161.

It is an arithmetic number, because the mean of its divisors is an integer number (60772161).

Almost surely, 2^121544321 is an apocalyptic number.

It is an amenable number.

121544321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121544321 is an equidigital number, since it uses as much as digits as its factorization.

121544321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 121544321 is about 11024.7141006014. The cubic root of 121544321 is about 495.3493041764.

Adding to 121544321 its reverse (123445121), we get a palindrome (244989442).

The spelling of 121544321 in words is "one hundred twenty-one million, five hundred forty-four thousand, three hundred twenty-one".