243121003399 has 2 divisors, whose sum is σ = 243121003400. Its totient is φ = 243121003398.

The previous prime is 243121003397. The next prime is 243121003427. The reversal of 243121003399 is 993300121342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243121003399 - 2¹ = 243121003397 is a prime.

Together with 243121003397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121003397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560501699 + 121560501700.

It is an arithmetic number, because the mean of its divisors is an integer number (121560501700).

Almost surely, 2^243121003399 is an apocalyptic number.

243121003399 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121003399 is an equidigital number, since it uses as much as digits as its factorization.

243121003399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 243121003399 in words is "two hundred forty-three billion, one hundred twenty-one million, three thousand, three hundred ninety-nine".