243121233445 has 4 divisors (see below), whose sum is σ = 291745480140. Its totient is φ = 194496986752.

The previous prime is 243121233437. The next prime is 243121233463. The reversal of 243121233445 is 544332121342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 190551456484 + 52569776961 = 436522^2 + 229281^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121233445 - 2³ = 243121233437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121233445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24312123340 + ... + 24312123349.

It is an arithmetic number, because the mean of its divisors is an integer number (72936370035).

Almost surely, 2^243121233445 is an apocalyptic number.

It is an amenable number.

243121233445 is a deficient number, since it is larger than the sum of its proper divisors (48624246695).

243121233445 is an equidigital number, since it uses as much as digits as its factorization.

243121233445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48624246694.

The product of its digits is 69120, while the sum is 34.

Adding to 243121233445 its reverse (544332121342), we get a palindrome (787453354787).

The spelling of 243121233445 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-three thousand, four hundred forty-five".