21333104447 has 2 divisors, whose sum is σ = 21333104448. Its totient is φ = 21333104446.

The previous prime is 21333104437. The next prime is 21333104581. The reversal of 21333104447 is 74440133312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21333104447 - 2¹⁶ = 21333038911 is a prime.

It is a super-2 number, since 2×21333104447² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333104437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666552223 + 10666552224.

It is an arithmetic number, because the mean of its divisors is an integer number (10666552224).

Almost surely, 2^21333104447 is an apocalyptic number.

21333104447 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333104447 is an equidigital number, since it uses as much as digits as its factorization.

21333104447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 32.

Adding to 21333104447 its reverse (74440133312), we get a palindrome (95773237759).

The spelling of 21333104447 in words is "twenty-one billion, three hundred thirty-three million, one hundred four thousand, four hundred forty-seven".