121328399 has 2 divisors, whose sum is σ = 121328400. Its totient is φ = 121328398.

The previous prime is 121328387. The next prime is 121328419. The reversal of 121328399 is 993823121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121328399 - 2¹⁶ = 121262863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121328309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60664199 + 60664200.

It is an arithmetic number, because the mean of its divisors is an integer number (60664200).

Almost surely, 2^121328399 is an apocalyptic number.

121328399 is a deficient number, since it is larger than the sum of its proper divisors (1).

121328399 is an equidigital number, since it uses as much as digits as its factorization.

121328399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 121328399 is about 11014.9171127158. The cubic root of 121328399 is about 495.0558029801.

The spelling of 121328399 in words is "one hundred twenty-one million, three hundred twenty-eight thousand, three hundred ninety-nine".