21147133 has 32 divisors (see below), whose sum is σ = 27648000. Its totient is φ = 15738624.

The previous prime is 21147127. The next prime is 21147157. The reversal of 21147133 is 33174112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21147133 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 (21147163) 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, 106168 + ... + 106366.

It is an arithmetic number, because the mean of its divisors is an integer number (864000).

Almost surely, 2^21147133 is an apocalyptic number.

It is an amenable number.

21147133 is a deficient number, since it is larger than the sum of its proper divisors (6500867).

21147133 is a wasteful number, since it uses less digits than its factorization.

21147133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its digits is 504, while the sum is 22.

The square root of 21147133 is about 4598.6012003652. The cubic root of 21147133 is about 276.5352500820.

The spelling of 21147133 in words is "twenty-one million, one hundred forty-seven thousand, one hundred thirty-three".