21131133 has 8 divisors (see below), whose sum is σ = 28197696. Its totient is φ = 14076000.

The previous prime is 21131087. The next prime is 21131137. The reversal of 21131133 is 33113112.

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

It is not a de Polignac number, because 21131133 - 2⁶ = 21131069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131137) 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, 3448 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (3524712).

Almost surely, 2^21131133 is an apocalyptic number.

It is an amenable number.

21131133 is a deficient number, since it is larger than the sum of its proper divisors (7066563).

21131133 is a wasteful number, since it uses less digits than its factorization.

21131133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715.

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

The square root of 21131133 is about 4596.8612117400. The cubic root of 21131133 is about 276.4654899503.

Adding to 21131133 its reverse (33113112), we get a palindrome (54244245).

The spelling of 21131133 in words is "twenty-one million, one hundred thirty-one thousand, one hundred thirty-three".