32320021 has 2 divisors, whose sum is σ = 32320022. Its totient is φ = 32320020.

The previous prime is 32320019. The next prime is 32320027. The reversal of 32320021 is 12002323.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 13950225 = 4286^2 + 3735^2 .

It is a cyclic number.

It is not a de Polignac number, because 32320021 - 2¹ = 32320019 is a prime.

Together with 32320019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 32319983 and 32320010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32320027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16160010 + 16160011.

It is an arithmetic number, because the mean of its divisors is an integer number (16160011).

Almost surely, 2^32320021 is an apocalyptic number.

It is an amenable number.

32320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

32320021 is an equidigital number, since it uses as much as digits as its factorization.

32320021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 32320021 is about 5685.0700083640. The cubic root of 32320021 is about 318.5350386612.

Adding to 32320021 its reverse (12002323), we get a palindrome (44322344).

The spelling of 32320021 in words is "thirty-two million, three hundred twenty thousand, twenty-one".