1211243304011 has 4 divisors (see below), whose sum is σ = 1304415865872. Its totient is φ = 1118070742152.

The previous prime is 1211243303957. The next prime is 1211243304013. The reversal of 1211243304011 is 1104033421121.

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

It is a de Polignac number, because none of the positive numbers 2^k-1211243304011 is a prime.

It is a super-2 number, since 2×1211243304011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211243304013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46586280911 + ... + 46586280936.

It is an arithmetic number, because the mean of its divisors is an integer number (326103966468).

Almost surely, 2^{1211243304011} is an apocalyptic number.

1211243304011 is a deficient number, since it is larger than the sum of its proper divisors (93172561861).

1211243304011 is an equidigital number, since it uses as much as digits as its factorization.

1211243304011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93172561860.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1211243304011 its reverse (1104033421121), we get a palindrome (2315276725132).

The spelling of 1211243304011 in words is "one trillion, two hundred eleven billion, two hundred forty-three million, three hundred four thousand, eleven".