21211133 has 8 divisors (see below), whose sum is σ = 21443136. Its totient is φ = 20980800.

The previous prime is 21211109. The next prime is 21211139. The reversal of 21211133 is 33111212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211133 - 2⁸ = 21210877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68048 + ... + 68358.

It is an arithmetic number, because the mean of its divisors is an integer number (2680392).

Almost surely, 2^21211133 is an apocalyptic number.

It is an amenable number.

21211133 is a deficient number, since it is larger than the sum of its proper divisors (232003).

21211133 is a wasteful number, since it uses less digits than its factorization.

21211133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its digits is 36, while the sum is 14.

The square root of 21211133 is about 4605.5545811552. The cubic root of 21211133 is about 276.8139392685.

Adding to 21211133 its reverse (33111212), we get a palindrome (54322345).

The spelling of 21211133 in words is "twenty-one million, two hundred eleven thousand, one hundred thirty-three".