6421516 has 12 divisors (see below), whose sum is σ = 11477088. Its totient is φ = 3142352.

The previous prime is 6421511. The next prime is 6421523. The reversal of 6421516 is 6151246.

6421516 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6421511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16891 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (956424).

Almost surely, 2^6421516 is an apocalyptic number.

It is an amenable number.

6421516 is a deficient number, since it is larger than the sum of its proper divisors (5055572).

6421516 is a wasteful number, since it uses less digits than its factorization.

6421516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34208 (or 34206 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 6421516 is about 2534.0710329428. The cubic root of 6421516 is about 185.8713798421.

The spelling of 6421516 in words is "six million, four hundred twenty-one thousand, five hundred sixteen".