2021133423 has 16 divisors (see below), whose sum is σ = 2712763872. Its totient is φ = 1338480000.

The previous prime is 2021133371. The next prime is 2021133461. The reversal of 2021133423 is 3243311202.

It is not a de Polignac number, because 2021133423 - 2²⁵ = 1987578991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021133423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021933423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705013 + ... + 707873.

It is an arithmetic number, because the mean of its divisors is an integer number (169547742).

Almost surely, 2^2021133423 is an apocalyptic number.

2021133423 is a deficient number, since it is larger than the sum of its proper divisors (691630449).

2021133423 is a wasteful number, since it uses less digits than its factorization.

2021133423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2021133423 is about 44957.0175056131. The cubic root of 2021133423 is about 1264.3432509859.

Adding to 2021133423 its reverse (3243311202), we get a palindrome (5264444625).

The spelling of 2021133423 in words is "two billion, twenty-one million, one hundred thirty-three thousand, four hundred twenty-three".