243121210011 has 12 divisors (see below), whose sum is σ = 351203725080. Its totient is φ = 162067586400.

The previous prime is 243121209959. The next prime is 243121210091. The reversal of 243121210011 is 110012121342.

243121210011 is a `hidden beast` number, since 2 + 431 + 21 + 210 + 0 + 1 + 1 = 666.

243121210011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243121210011 - 2⁷ = 243121209883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243121210091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 984565 + ... + 1206486.

It is an arithmetic number, because the mean of its divisors is an integer number (29266977090).

Almost surely, 2^243121210011 is an apocalyptic number.

243121210011 is a deficient number, since it is larger than the sum of its proper divisors (108082515069).

243121210011 is a wasteful number, since it uses less digits than its factorization.

243121210011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203386 (or 2203383 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 243121210011 its reverse (110012121342), we get a palindrome (353133331353).

The spelling of 243121210011 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred ten thousand, eleven".