63211221 has 6 divisors (see below), whose sum is σ = 91305110. Its totient is φ = 42140808.

The previous prime is 63211177. The next prime is 63211241. The reversal of 63211221 is 12211236.

63211221 is a `hidden beast` number, since 632 + 1 + 12 + 21 = 666.

63211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 2604996 = 7785^2 + 1614^2 .

It is not a de Polignac number, because 63211221 - 2¹⁰ = 63210197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63211194 and 63211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63211241) 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 in 5 ways as a sum of consecutive naturals, for example, 3511726 + ... + 3511743.

Almost surely, 2^63211221 is an apocalyptic number.

It is an amenable number.

63211221 is a deficient number, since it is larger than the sum of its proper divisors (28093889).

63211221 is a wasteful number, since it uses less digits than its factorization.

63211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023475 (or 7023472 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 63211221 is about 7950.5484716465. The cubic root of 63211221 is about 398.3499128074.

Adding to 63211221 its reverse (12211236), we get a palindrome (75422457).

The spelling of 63211221 in words is "sixty-three million, two hundred eleven thousand, two hundred twenty-one".