243121213499 has 2 divisors, whose sum is σ = 243121213500. Its totient is φ = 243121213498.

The previous prime is 243121213373. The next prime is 243121213507. The reversal of 243121213499 is 994312121342.

243121213499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121213499 - 2¹² = 243121209403 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121263499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560606749 + 121560606750.

It is an arithmetic number, because the mean of its divisors is an integer number (121560606750).

Almost surely, 2^243121213499 is an apocalyptic number.

243121213499 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121213499 is an equidigital number, since it uses as much as digits as its factorization.

243121213499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The spelling of 243121213499 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirteen thousand, four hundred ninety-nine".