21010333321 has 2 divisors, whose sum is σ = 21010333322. Its totient is φ = 21010333320.

The previous prime is 21010333313. The next prime is 21010333349. The reversal of 21010333321 is 12333301012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19617924096 + 1392409225 = 140064^2 + 37315^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010333321 - 2³ = 21010333313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010333391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505166660 + 10505166661.

It is an arithmetic number, because the mean of its divisors is an integer number (10505166661).

Almost surely, 2^21010333321 is an apocalyptic number.

It is an amenable number.

21010333321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010333321 is an equidigital number, since it uses as much as digits as its factorization.

21010333321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21010333321 its reverse (12333301012), we get a palindrome (33343634333).

The spelling of 21010333321 in words is "twenty-one billion, ten million, three hundred thirty-three thousand, three hundred twenty-one".