21113133 has 32 divisors (see below), whose sum is σ = 31072896. Its totient is φ = 12699648.

The previous prime is 21113119. The next prime is 21113153. The reversal of 21113133 is 33131112.

It is not a de Polignac number, because 21113133 - 2⁵ = 21113101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197266 + ... + 197372.

It is an arithmetic number, because the mean of its divisors is an integer number (971028).

Almost surely, 2^21113133 is an apocalyptic number.

It is an amenable number.

21113133 is a deficient number, since it is larger than the sum of its proper divisors (9959763).

21113133 is a wasteful number, since it uses less digits than its factorization.

21113133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253.

The product of its digits is 54, while the sum is 15.

The square root of 21113133 is about 4594.9029369509. The cubic root of 21113133 is about 276.3869676977.

Adding to 21113133 its reverse (33131112), we get a palindrome (54244245).

The spelling of 21113133 in words is "twenty-one million, one hundred thirteen thousand, one hundred thirty-three".