243121120311 has 4 divisors (see below), whose sum is σ = 324161493752. Its totient is φ = 162080746872.

The previous prime is 243121120223. The next prime is 243121120327. The reversal of 243121120311 is 113021121342.

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

It is not a de Polignac number, because 243121120311 - 2¹¹ = 243121118263 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 (243121121311) 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, 40520186716 + ... + 40520186721.

It is an arithmetic number, because the mean of its divisors is an integer number (81040373438).

Almost surely, 2^243121120311 is an apocalyptic number.

243121120311 is a deficient number, since it is larger than the sum of its proper divisors (81040373441).

243121120311 is an equidigital number, since it uses as much as digits as its factorization.

243121120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81040373440.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 243121120311 its reverse (113021121342), we get a palindrome (356142241653).

The spelling of 243121120311 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twenty thousand, three hundred eleven".