21133005 has 8 divisors (see below), whose sum is σ = 33812832. Its totient is φ = 11270928.

The previous prime is 21133003. The next prime is 21133009. The reversal of 21133005 is 50033112.

It is a happy number.

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

It is not a de Polignac number, because 21133005 - 2¹ = 21133003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1408867 = 21133005 / (2 + 1 + 1 + 3 + 3 + 0 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704419 + ... + 704448.

It is an arithmetic number, because the mean of its divisors is an integer number (4226604).

Almost surely, 2^21133005 is an apocalyptic number.

It is an amenable number.

21133005 is a deficient number, since it is larger than the sum of its proper divisors (12679827).

21133005 is a wasteful number, since it uses less digits than its factorization.

21133005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408875.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21133005 is about 4597.0648244287. The cubic root of 21133005 is about 276.4736537043.

Adding to 21133005 its reverse (50033112), we get a palindrome (71166117).

The spelling of 21133005 in words is "twenty-one million, one hundred thirty-three thousand, five".