21301333 has 4 divisors (see below), whose sum is σ = 21454720. Its totient is φ = 21147948.

The previous prime is 21301331. The next prime is 21301339. The reversal of 21301333 is 33310312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21301333 - 2¹ = 21301331 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 (21301331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76485 + ... + 76762.

It is an arithmetic number, because the mean of its divisors is an integer number (5363680).

Almost surely, 2^21301333 is an apocalyptic number.

It is an amenable number.

21301333 is a deficient number, since it is larger than the sum of its proper divisors (153387).

21301333 is a wasteful number, since it uses less digits than its factorization.

21301333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153386.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 21301333 is about 4615.3367157771. The cubic root of 21301333 is about 277.2057666455.

Adding to 21301333 its reverse (33310312), we get a palindrome (54611645).

The spelling of 21301333 in words is "twenty-one million, three hundred one thousand, three hundred thirty-three".