243121324243427 has 4 divisors (see below), whose sum is σ = 277852941992496. Its totient is φ = 208389706494360.

The previous prime is 243121324243409. The next prime is 243121324243451. The reversal of 243121324243427 is 724342423121342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243121324243427 - 2²⁰ = 243121323194851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121324243627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17365808874524 + ... + 17365808874537.

It is an arithmetic number, because the mean of its divisors is an integer number (69463235498124).

Almost surely, 2^{243121324243427} is an apocalyptic number.

243121324243427 is a deficient number, since it is larger than the sum of its proper divisors (34731617749069).

243121324243427 is an equidigital number, since it uses as much as digits as its factorization.

243121324243427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34731617749068.

The product of its digits is 1548288, while the sum is 44.

Adding to 243121324243427 its reverse (724342423121342), we get a palindrome (967463747364769).

The spelling of 243121324243427 in words is "two hundred forty-three trillion, one hundred twenty-one billion, three hundred twenty-four million, two hundred forty-three thousand, four hundred twenty-seven".