20031121133 has 2 divisors, whose sum is σ = 20031121134. Its totient is φ = 20031121132.

The previous prime is 20031121069. The next prime is 20031121139. The reversal of 20031121133 is 33112113002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16466792329 + 3564328804 = 128323^2 + 59702^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031121133 - 2⁶ = 20031121069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031121139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015560566 + 10015560567.

It is an arithmetic number, because the mean of its divisors is an integer number (10015560567).

Almost surely, 2^20031121133 is an apocalyptic number.

It is an amenable number.

20031121133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031121133 is an equidigital number, since it uses as much as digits as its factorization.

20031121133 is an evil number, because the sum of its binary digits is even.

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

Adding to 20031121133 its reverse (33112113002), we get a palindrome (53143234135).

The spelling of 20031121133 in words is "twenty billion, thirty-one million, one hundred twenty-one thousand, one hundred thirty-three".