243121212011 has 2 divisors, whose sum is σ = 243121212012. Its totient is φ = 243121212010.

The previous prime is 243121211999. The next prime is 243121212049. The reversal of 243121212011 is 110212121342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243121212011 - 2¹⁴ = 243121195627 is a prime.

It is a super-2 number, since 2×243121212011² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (243121212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560606005 + 121560606006.

It is an arithmetic number, because the mean of its divisors is an integer number (121560606006).

Almost surely, 2^243121212011 is an apocalyptic number.

243121212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121212011 is an equidigital number, since it uses as much as digits as its factorization.

243121212011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 243121212011 its reverse (110212121342), we get a palindrome (353333333353).

The spelling of 243121212011 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twelve thousand, eleven".