243121043105 has 32 divisors (see below), whose sum is σ = 315016646400. Its totient is φ = 179574368512.

The previous prime is 243121043101. The next prime is 243121043147. The reversal of 243121043105 is 501340121342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243121043105 - 2² = 243121043101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243121043101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15056126 + ... + 15072264.

It is an arithmetic number, because the mean of its divisors is an integer number (9844270200).

Almost surely, 2^243121043105 is an apocalyptic number.

It is an amenable number.

243121043105 is a deficient number, since it is larger than the sum of its proper divisors (71895603295).

243121043105 is a wasteful number, since it uses less digits than its factorization.

243121043105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20713.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243121043105 its reverse (501340121342), we get a palindrome (744461164447).

The spelling of 243121043105 in words is "two hundred forty-three billion, one hundred twenty-one million, forty-three thousand, one hundred five".