21333371 has 8 divisors (see below), whose sum is σ = 22664400. Its totient is φ = 20023200.

The previous prime is 21333353. The next prime is 21333413. The reversal of 21333371 is 17333312.

It is a happy number.

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 21333371 - 2¹⁰ = 21332347 is a prime.

It is a super-2 number, since 2×21333371² = 910225436447282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333271) 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, 3080 + ... + 7221.

It is an arithmetic number, because the mean of its divisors is an integer number (2833050).

Almost surely, 2^21333371 is an apocalyptic number.

21333371 is a deficient number, since it is larger than the sum of its proper divisors (1331029).

21333371 is a wasteful number, since it uses less digits than its factorization.

21333371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10429.

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

The square root of 21333371 is about 4618.8062310515. The cubic root of 21333371 is about 277.3446729690.

Adding to 21333371 its reverse (17333312), we get a palindrome (38666683).

The spelling of 21333371 in words is "twenty-one million, three hundred thirty-three thousand, three hundred seventy-one".