63450221 has 2 divisors, whose sum is σ = 63450222. Its totient is φ = 63450220.

The previous prime is 63450209. The next prime is 63450223. The reversal of 63450221 is 12205436.

63450221 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 + 422500 = 7939^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 63450221 - 2⁶ = 63450157 is a prime.

Together with 63450223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63450223) 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, 31725110 + 31725111.

It is an arithmetic number, because the mean of its divisors is an integer number (31725111).

Almost surely, 2^63450221 is an apocalyptic number.

It is an amenable number.

63450221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63450221 is an equidigital number, since it uses as much as digits as its factorization.

63450221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 63450221 is about 7965.5647006349. The cubic root of 63450221 is about 398.8513316433.

Adding to 63450221 its reverse (12205436), we get a palindrome (75655657).

The spelling of 63450221 in words is "sixty-three million, four hundred fifty thousand, two hundred twenty-one".