11131220033 has 4 divisors (see below), whose sum is σ = 11785997700. Its totient is φ = 10476442368.

The previous prime is 11131220027. The next prime is 11131220057. The reversal of 11131220033 is 33002213111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33002213111 = 7 ⋅4714601873.

It can be written as a sum of positive squares in 2 ways, for example, as 7657650064 + 3473569969 = 87508^2 + 58937^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131220033 - 2¹⁸ = 11130957889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 654777649 = 11131220033 / (1 + 1 + 1 + 3 + 1 + 2 + 2 + 0 + 0 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11131219993 and 11131220020.

It is not an unprimeable number, because it can be changed into a prime (11131222033) 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, 327388808 + ... + 327388841.

It is an arithmetic number, because the mean of its divisors is an integer number (2946499425).

Almost surely, 2^11131220033 is an apocalyptic number.

It is an amenable number.

11131220033 is a deficient number, since it is larger than the sum of its proper divisors (654777667).

11131220033 is an equidigital number, since it uses as much as digits as its factorization.

11131220033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654777666.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 11131220033 its reverse (33002213111), we get a palindrome (44133433144).

The spelling of 11131220033 in words is "eleven billion, one hundred thirty-one million, two hundred twenty thousand, thirty-three".