63221321 has 2 divisors, whose sum is σ = 63221322. Its totient is φ = 63221320.

The previous prime is 63221299. The next prime is 63221329. The reversal of 63221321 is 12312236.

It is a happy number.

63221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63027721 + 193600 = 7939^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63221321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 63221293 and 63221302.

It is not a weakly prime, because it can be changed into another prime (63221329) 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, 31610660 + 31610661.

It is an arithmetic number, because the mean of its divisors is an integer number (31610661).

Almost surely, 2^63221321 is an apocalyptic number.

It is an amenable number.

63221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

63221321 is an equidigital number, since it uses as much as digits as its factorization.

63221321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 63221321 is about 7951.1836225810. The cubic root of 63221321 is about 398.3711280272.

Adding to 63221321 its reverse (12312236), we get a palindrome (75533557).

The spelling of 63221321 in words is "sixty-three million, two hundred twenty-one thousand, three hundred twenty-one".