21032333209 has 2 divisors, whose sum is σ = 21032333210. Its totient is φ = 21032333208.

The previous prime is 21032333159. The next prime is 21032333213. The reversal of 21032333209 is 90233323012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13316467609 + 7715865600 = 115397^2 + 87840^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032333209 - 2¹⁵ = 21032300441 is a prime.

It is not a weakly prime, because it can be changed into another prime (21032333219) 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, 10516166604 + 10516166605.

It is an arithmetic number, because the mean of its divisors is an integer number (10516166605).

Almost surely, 2^21032333209 is an apocalyptic number.

It is an amenable number.

21032333209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032333209 is an equidigital number, since it uses as much as digits as its factorization.

21032333209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The spelling of 21032333209 in words is "twenty-one billion, thirty-two million, three hundred thirty-three thousand, two hundred nine".