21396133 has 8 divisors (see below), whose sum is σ = 23400576. Its totient is φ = 19401600.

The previous prime is 21396119. The next prime is 21396161. The reversal of 21396133 is 33169312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21396133 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 (21396103) 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, 2485 + ... + 6997.

It is an arithmetic number, because the mean of its divisors is an integer number (2925072).

Almost surely, 2^21396133 is an apocalyptic number.

It is an amenable number.

21396133 is a deficient number, since it is larger than the sum of its proper divisors (2004443).

21396133 is a wasteful number, since it uses less digits than its factorization.

21396133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955.

The product of its digits is 2916, while the sum is 28.

The square root of 21396133 is about 4625.5954211323. The cubic root of 21396133 is about 277.6163859930.

The spelling of 21396133 in words is "twenty-one million, three hundred ninety-six thousand, one hundred thirty-three".