20133111121 has 2 divisors, whose sum is σ = 20133111122. Its totient is φ = 20133111120.

The previous prime is 20133111091. The next prime is 20133111161. The reversal of 20133111121 is 12111133102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19941676225 + 191434896 = 141215^2 + 13836^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133111121 - 2¹⁵ = 20133078353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20133111095 and 20133111104.

It is not a weakly prime, because it can be changed into another prime (20133111161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066555560 + 10066555561.

It is an arithmetic number, because the mean of its divisors is an integer number (10066555561).

Almost surely, 2^20133111121 is an apocalyptic number.

It is an amenable number.

20133111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133111121 is an equidigital number, since it uses as much as digits as its factorization.

20133111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20133111121 its reverse (12111133102), we get a palindrome (32244244223).

The spelling of 20133111121 in words is "twenty billion, one hundred thirty-three million, one hundred eleven thousand, one hundred twenty-one".