1211340133 has 4 divisors (see below), whose sum is σ = 1212178720. Its totient is φ = 1210501548.

The previous prime is 1211340131. The next prime is 1211340157. The reversal of 1211340133 is 3310431121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3310431121 = 16087 ⋅205783.

It is a cyclic number.

It is not a de Polignac number, because 1211340133 - 2¹ = 1211340131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211340133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211340131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417123 + ... + 420016.

It is an arithmetic number, because the mean of its divisors is an integer number (303044680).

Almost surely, 2^1211340133 is an apocalyptic number.

It is an amenable number.

1211340133 is a deficient number, since it is larger than the sum of its proper divisors (838587).

1211340133 is an equidigital number, since it uses as much as digits as its factorization.

1211340133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838586.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1211340133 is about 34804.3119886028. The cubic root of 1211340133 is about 1065.9954934707.

Adding to 1211340133 its reverse (3310431121), we get a palindrome (4521771254).

The spelling of 1211340133 in words is "one billion, two hundred eleven million, three hundred forty thousand, one hundred thirty-three".