320632421 has 2 divisors, whose sum is σ = 320632422. Its totient is φ = 320632420.

The previous prime is 320632363. The next prime is 320632451. The reversal of 320632421 is 124236023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318229921 + 2402500 = 17839^2 + 1550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320632421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320632451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160316210 + 160316211.

It is an arithmetic number, because the mean of its divisors is an integer number (160316211).

Almost surely, 2^320632421 is an apocalyptic number.

It is an amenable number.

320632421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320632421 is an equidigital number, since it uses as much as digits as its factorization.

320632421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 320632421 is about 17906.2117992612. The cubic root of 320632421 is about 684.4406757820.

Adding to 320632421 its reverse (124236023), we get a palindrome (444868444).

The spelling of 320632421 in words is "three hundred twenty million, six hundred thirty-two thousand, four hundred twenty-one".