243145021111 has 4 divisors (see below), whose sum is σ = 253716543792. Its totient is φ = 232573498432.

The previous prime is 243145021099. The next prime is 243145021139. The reversal of 243145021111 is 111120541342.

It is a happy number.

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 243145021111 - 2¹³ = 243145012919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243145021711) 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, 5285761306 + ... + 5285761351.

It is an arithmetic number, because the mean of its divisors is an integer number (63429135948).

Almost surely, 2^243145021111 is an apocalyptic number.

243145021111 is a deficient number, since it is larger than the sum of its proper divisors (10571522681).

243145021111 is a wasteful number, since it uses less digits than its factorization.

243145021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10571522680.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 243145021111 its reverse (111120541342), we get a palindrome (354265562453).

The spelling of 243145021111 in words is "two hundred forty-three billion, one hundred forty-five million, twenty-one thousand, one hundred eleven".