2111133121 has 4 divisors (see below), whose sum is σ = 2112399700. Its totient is φ = 2109866544.

The previous prime is 2111133109. The next prime is 2111133163. The reversal of 2111133121 is 1213311112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1146161025 + 964972096 = 33855^2 + 31064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111133121 - 2⁹ = 2111132609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111133095 and 2111133104.

It is not an unprimeable number, because it can be changed into a prime (2111133181) 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, 630786 + ... + 634123.

It is an arithmetic number, because the mean of its divisors is an integer number (528099925).

Almost surely, 2^2111133121 is an apocalyptic number.

It is an amenable number.

2111133121 is a deficient number, since it is larger than the sum of its proper divisors (1266579).

2111133121 is a wasteful number, since it uses less digits than its factorization.

2111133121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266578.

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

The square root of 2111133121 is about 45947.0686877846. The cubic root of 2111133121 is about 1282.8381685723.

Adding to 2111133121 its reverse (1213311112), we get a palindrome (3324444233).

The spelling of 2111133121 in words is "two billion, one hundred eleven million, one hundred thirty-three thousand, one hundred twenty-one".