21233371 has 2 divisors, whose sum is σ = 21233372. Its totient is φ = 21233370.

The previous prime is 21233369. The next prime is 21233389. The reversal of 21233371 is 17333212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21233371 - 2¹ = 21233369 is a prime.

Together with 21233369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21233321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616685 + 10616686.

It is an arithmetic number, because the mean of its divisors is an integer number (10616686).

Almost surely, 2^21233371 is an apocalyptic number.

21233371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233371 is an equidigital number, since it uses as much as digits as its factorization.

21233371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 22.

The square root of 21233371 is about 4607.9682073556. The cubic root of 21233371 is about 276.9106438051.

Adding to 21233371 its reverse (17333212), we get a palindrome (38566583).

The spelling of 21233371 in words is "twenty-one million, two hundred thirty-three thousand, three hundred seventy-one".