21371333 has 4 divisors (see below), whose sum is σ = 22496160. Its totient is φ = 20246508.

The previous prime is 21371299. The next prime is 21371341. The reversal of 21371333 is 33317312.

It is a happy number.

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 21371333 - 2⁶ = 21371269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21371299 and 21371308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562385 + ... + 562422.

It is an arithmetic number, because the mean of its divisors is an integer number (5624040).

Almost surely, 2^21371333 is an apocalyptic number.

It is an amenable number.

21371333 is a deficient number, since it is larger than the sum of its proper divisors (1124827).

21371333 is a wasteful number, since it uses less digits than its factorization.

21371333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124826.

The product of its digits is 1134, while the sum is 23.

The square root of 21371333 is about 4622.9139079157. The cubic root of 21371333 is about 277.5090839220.

Adding to 21371333 its reverse (33317312), we get a palindrome (54688645).

The spelling of 21371333 in words is "twenty-one million, three hundred seventy-one thousand, three hundred thirty-three".