1211320331233 has 4 divisors (see below), whose sum is σ = 1217662322688. Its totient is φ = 1204978339780.

The previous prime is 1211320331231. The next prime is 1211320331239. The reversal of 1211320331233 is 3321330231121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211320331233 - 2¹ = 1211320331231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211320331198 and 1211320331207.

It is not an unprimeable number, because it can be changed into a prime (1211320331231) 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, 3170995441 + ... + 3170995822.

It is an arithmetic number, because the mean of its divisors is an integer number (304415580672).

Almost surely, 2^{1211320331233} is an apocalyptic number.

It is an amenable number.

1211320331233 is a deficient number, since it is larger than the sum of its proper divisors (6341991455).

1211320331233 is an equidigital number, since it uses as much as digits as its factorization.

1211320331233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341991454.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1211320331233 its reverse (3321330231121), we get a palindrome (4532650562354).

The spelling of 1211320331233 in words is "one trillion, two hundred eleven billion, three hundred twenty million, three hundred thirty-one thousand, two hundred thirty-three".