63716021 has 4 divisors (see below), whose sum is σ = 63861600. Its totient is φ = 63570444.

The previous prime is 63715999. The next prime is 63716033. The reversal of 63716021 is 12061736.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63716021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63716321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72131 + ... + 73008.

It is an arithmetic number, because the mean of its divisors is an integer number (15965400).

Almost surely, 2^63716021 is an apocalyptic number.

It is an amenable number.

63716021 is a deficient number, since it is larger than the sum of its proper divisors (145579).

63716021 is a wasteful number, since it uses less digits than its factorization.

63716021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145578.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 63716021 is about 7982.2315802036. The cubic root of 63716021 is about 399.4074998757.

Adding to 63716021 its reverse (12061736), we get a palindrome (75777757).

The spelling of 63716021 in words is "sixty-three million, seven hundred sixteen thousand, twenty-one".