63916421 has 4 divisors (see below), whose sum is σ = 63961344. Its totient is φ = 63871500.

The previous prime is 63916373. The next prime is 63916423. The reversal of 63916421 is 12461936.

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-63916421 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 (63916423) 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, 20255 + ... + 23196.

It is an arithmetic number, because the mean of its divisors is an integer number (15990336).

Almost surely, 2^63916421 is an apocalyptic number.

It is an amenable number.

63916421 is a deficient number, since it is larger than the sum of its proper divisors (44923).

63916421 is a wasteful number, since it uses less digits than its factorization.

63916421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44922.

The product of its digits is 7776, while the sum is 32.

The square root of 63916421 is about 7994.7746059536. The cubic root of 63916421 is about 399.8258012313.

The spelling of 63916421 in words is "sixty-three million, nine hundred sixteen thousand, four hundred twenty-one".