21202132321 has 8 divisors (see below), whose sum is σ = 21241379304. Its totient is φ = 21162910080.

The previous prime is 21202132309. The next prime is 21202132327. The reversal of 21202132321 is 12323120212.

It can be written as a sum of positive squares in 4 ways, for example, as 742835025 + 20459297296 = 27255^2 + 143036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21202132321 - 2⁹ = 21202131809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202132327) 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 in 7 ways as a sum of consecutive naturals, for example, 2807811 + ... + 2815351.

It is an arithmetic number, because the mean of its divisors is an integer number (2655172413).

Almost surely, 2^21202132321 is an apocalyptic number.

It is an amenable number.

21202132321 is a deficient number, since it is larger than the sum of its proper divisors (39246983).

21202132321 is an equidigital number, since it uses as much as digits as its factorization.

21202132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12371.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21202132321 its reverse (12323120212), we get a palindrome (33525252533).

The spelling of 21202132321 in words is "twenty-one billion, two hundred two million, one hundred thirty-two thousand, three hundred twenty-one".