63216499461221 has 2 divisors, whose sum is σ = 63216499461222. Its totient is φ = 63216499461220.

The previous prime is 63216499461209. The next prime is 63216499461253. The reversal of 63216499461221 is 12216499461236.

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., 60180590488225 + 3035908972996 = 7757615^2 + 1742386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63216499461221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63216499461721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31608249730610 + 31608249730611.

It is an arithmetic number, because the mean of its divisors is an integer number (31608249730611).

Almost surely, 2^{63216499461221} is an apocalyptic number.

It is an amenable number.

63216499461221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63216499461221 is an equidigital number, since it uses as much as digits as its factorization.

63216499461221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 56.

The spelling of 63216499461221 in words is "sixty-three trillion, two hundred sixteen billion, four hundred ninety-nine million, four hundred sixty-one thousand, two hundred twenty-one".