243121220345 has 8 divisors (see below), whose sum is σ = 295023503880. Its totient is φ = 192311616640.

The previous prime is 243121220339. The next prime is 243121220351. The reversal of 243121220345 is 543022121342.

It is an interprime number because it is at equal distance from previous prime (243121220339) and next prime (243121220351).

It can be written as a sum of positive squares in 4 ways, for example, as 2558437561 + 240562782784 = 50581^2 + 490472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243121220345 - 2²⁶ = 243054111481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273169466 + ... + 273170355.

It is an arithmetic number, because the mean of its divisors is an integer number (36877937985).

Almost surely, 2^243121220345 is an apocalyptic number.

It is an amenable number.

243121220345 is a deficient number, since it is larger than the sum of its proper divisors (51902283535).

243121220345 is an equidigital number, since it uses as much as digits as its factorization.

243121220345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546339915.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 243121220345 its reverse (543022121342), we get a palindrome (786143341687).

The spelling of 243121220345 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred forty-five".