21333353 has 2 divisors, whose sum is σ = 21333354. Its totient is φ = 21333352.

The previous prime is 21333329. The next prime is 21333413. The reversal of 21333353 is 35333312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 2601769 = 4328^2 + 1613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333353 - 2⁸ = 21333097 is a prime.

It is a super-2 number, since 2×21333353² = 910223900445218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21833353) 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, 10666676 + 10666677.

It is an arithmetic number, because the mean of its divisors is an integer number (10666677).

Almost surely, 2^21333353 is an apocalyptic number.

It is an amenable number.

21333353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333353 is an equidigital number, since it uses as much as digits as its factorization.

21333353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 23.

The square root of 21333353 is about 4618.8042824956. The cubic root of 21333353 is about 277.3445949659.

Adding to 21333353 its reverse (35333312), we get a palindrome (56666665).

The spelling of 21333353 in words is "twenty-one million, three hundred thirty-three thousand, three hundred fifty-three".