21333107 has 2 divisors, whose sum is σ = 21333108. Its totient is φ = 21333106.

The previous prime is 21333097. The next prime is 21333133. The reversal of 21333107 is 70133312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21333107 - 2¹⁴ = 21316723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21333187) 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 as a sum of consecutive naturals, namely, 10666553 + 10666554.

It is an arithmetic number, because the mean of its divisors is an integer number (10666554).

Almost surely, 2^21333107 is an apocalyptic number.

21333107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333107 is an equidigital number, since it uses as much as digits as its factorization.

21333107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 21333107 is about 4618.7776521500. Note that the first 3 decimals coincide. The cubic root of 21333107 is about 277.3435289195.

Adding to 21333107 its reverse (70133312), we get a palindrome (91466419).

The spelling of 21333107 in words is "twenty-one million, three hundred thirty-three thousand, one hundred seven".