21032233021 has 2 divisors, whose sum is σ = 21032233022. Its totient is φ = 21032233020.

The previous prime is 21032232997. The next prime is 21032233037. The reversal of 21032233021 is 12033223012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20660900121 + 371332900 = 143739^2 + 19270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032233021 - 2⁹ = 21032232509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21032233021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21032233051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516116510 + 10516116511.

It is an arithmetic number, because the mean of its divisors is an integer number (10516116511).

Almost surely, 2^21032233021 is an apocalyptic number.

It is an amenable number.

21032233021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032233021 is an equidigital number, since it uses as much as digits as its factorization.

21032233021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21032233021 its reverse (12033223012), we get a palindrome (33065456033).

The spelling of 21032233021 in words is "twenty-one billion, thirty-two million, two hundred thirty-three thousand, twenty-one".