121544143321 has 2 divisors, whose sum is σ = 121544143322. Its totient is φ = 121544143320.

The previous prime is 121544143307. The next prime is 121544143367. The reversal of 121544143321 is 123341445121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115728555721 + 5815587600 = 340189^2 + 76260^2 .

It is a cyclic number.

It is not a de Polignac number, because 121544143321 - 2⁵ = 121544143289 is a prime.

It is not a weakly prime, because it can be changed into another prime (121544147321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60772071660 + 60772071661.

It is an arithmetic number, because the mean of its divisors is an integer number (60772071661).

Almost surely, 2^121544143321 is an apocalyptic number.

It is an amenable number.

121544143321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121544143321 is an equidigital number, since it uses as much as digits as its factorization.

121544143321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

Adding to 121544143321 its reverse (123341445121), we get a palindrome (244885588442).

The spelling of 121544143321 in words is "one hundred twenty-one billion, five hundred forty-four million, one hundred forty-three thousand, three hundred twenty-one".