1211123131033 has 4 divisors (see below), whose sum is σ = 1211270495760. Its totient is φ = 1210975766308.

The previous prime is 1211123131019. The next prime is 1211123131061. The reversal of 1211123131033 is 3301313211121.

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 a de Polignac number, because none of the positive numbers 2^k-1211123131033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211123130995 and 1211123131013.

It is not an unprimeable number, because it can be changed into a prime (1211123131093) 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, 73670035 + ... + 73686472.

It is an arithmetic number, because the mean of its divisors is an integer number (302817623940).

Almost surely, 2^{1211123131033} is an apocalyptic number.

It is an amenable number.

1211123131033 is a deficient number, since it is larger than the sum of its proper divisors (147364727).

1211123131033 is an equidigital number, since it uses as much as digits as its factorization.

1211123131033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147364726.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211123131033 its reverse (3301313211121), we get a palindrome (4512436342154).

The spelling of 1211123131033 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred thirty-one thousand, thirty-three".