2133918891 has 24 divisors (see below), whose sum is σ = 3423256560. Its totient is φ = 1313178048.

The previous prime is 2133918881. The next prime is 2133918893. The reversal of 2133918891 is 1988193312.

It is not a de Polignac number, because 2133918891 - 2¹⁰ = 2133917867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2133918893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229266 + ... + 238391.

It is an arithmetic number, because the mean of its divisors is an integer number (142635690).

Almost surely, 2^2133918891 is an apocalyptic number.

2133918891 is a deficient number, since it is larger than the sum of its proper divisors (1289337669).

2133918891 is a wasteful number, since it uses less digits than its factorization.

2133918891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467692 (or 467673 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 2133918891 is about 46194.3599479417. The cubic root of 2133918891 is about 1287.4369498895.

The spelling of 2133918891 in words is "two billion, one hundred thirty-three million, nine hundred eighteen thousand, eight hundred ninety-one".