20111205133 has 12 divisors (see below), whose sum is σ = 20367390708. Its totient is φ = 19858192640.

The previous prime is 20111205113. The next prime is 20111205161. The reversal of 20111205133 is 33150211102.

It can be written as a sum of positive squares in 6 ways, for example, as 5883963849 + 14227241284 = 76707^2 + 119278^2 .

It is not a de Polignac number, because 20111205133 - 2⁹ = 20111204621 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 20111205133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111205113) 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 11 ways as a sum of consecutive naturals, for example, 8402985 + ... + 8405377.

It is an arithmetic number, because the mean of its divisors is an integer number (1697282559).

Almost surely, 2^20111205133 is an apocalyptic number.

It is an amenable number.

20111205133 is a deficient number, since it is larger than the sum of its proper divisors (256185575).

20111205133 is an equidigital number, since it uses as much as digits as its factorization.

20111205133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632 (or 3543 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 20111205133 its reverse (33150211102), we get a palindrome (53261416235).

The spelling of 20111205133 in words is "twenty billion, one hundred eleven million, two hundred five thousand, one hundred thirty-three".