21300133 has 8 divisors (see below), whose sum is σ = 22787352. Its totient is φ = 19838976.

The previous prime is 21300127. The next prime is 21300137. The reversal of 21300133 is 33100312.

It can be written as a sum of positive squares in 4 ways, for example, as 5602689 + 15697444 = 2367^2 + 3962^2 .

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 21300133 - 2⁵ = 21300101 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 (21300137) 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, 4810 + ... + 8107.

It is an arithmetic number, because the mean of its divisors is an integer number (2848419).

Almost surely, 2^21300133 is an apocalyptic number.

It is an amenable number.

21300133 is a deficient number, since it is larger than the sum of its proper divisors (1487219).

21300133 is a wasteful number, since it uses less digits than its factorization.

21300133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21300133 is about 4615.2067125970. The cubic root of 21300133 is about 277.2005611314.

Adding to 21300133 its reverse (33100312), we get a palindrome (54400445).

The spelling of 21300133 in words is "twenty-one million, three hundred thousand, one hundred thirty-three".