1211333012213 has 4 divisors (see below), whose sum is σ = 1231190930508. Its totient is φ = 1191475093920.

The previous prime is 1211333012189. The next prime is 1211333012221. The reversal of 1211333012213 is 3122103331121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 404600310724 + 806732701489 = 636082^2 + 898183^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211333012213 - 2²⁰ = 1211331963637 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 (1211333012233) 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 3 ways as a sum of consecutive naturals, for example, 9928959056 + ... + 9928959177.

It is an arithmetic number, because the mean of its divisors is an integer number (307797732627).

Almost surely, 2^{1211333012213} is an apocalyptic number.

It is an amenable number.

1211333012213 is a deficient number, since it is larger than the sum of its proper divisors (19857918295).

1211333012213 is an equidigital number, since it uses as much as digits as its factorization.

1211333012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19857918294.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211333012213 its reverse (3122103331121), we get a palindrome (4333436343334).

The spelling of 1211333012213 in words is "one trillion, two hundred eleven billion, three hundred thirty-three million, twelve thousand, two hundred thirteen".