16421918 has 8 divisors (see below), whose sum is σ = 24663312. Its totient is φ = 8200816.

The previous prime is 16421897. The next prime is 16421963. The reversal of 16421918 is 81912461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2855 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (3082914).

Almost surely, 2^16421918 is an apocalyptic number.

16421918 is a deficient number, since it is larger than the sum of its proper divisors (8241394).

16421918 is an equidigital number, since it uses as much as digits as its factorization.

16421918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146.

The product of its digits is 3456, while the sum is 32.

The square root of 16421918 is about 4052.3965748678. The cubic root of 16421918 is about 254.1799518392.

The spelling of 16421918 in words is "sixteen million, four hundred twenty-one thousand, nine hundred eighteen".