16421998 has 8 divisors (see below), whose sum is σ = 24661008. Its totient is φ = 8201664.

The previous prime is 16421963. The next prime is 16422019. The reversal of 16421998 is 89912461.

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

It is a self number, because there is not a number n which added to its sum of digits gives 16421998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2211 + ... + 6142.

It is an arithmetic number, because the mean of its divisors is an integer number (3082626).

Almost surely, 2^16421998 is an apocalyptic number.

16421998 is a deficient number, since it is larger than the sum of its proper divisors (8239010).

16421998 is an equidigital number, since it uses as much as digits as its factorization.

16421998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338.

The product of its digits is 31104, while the sum is 40.

The square root of 16421998 is about 4052.4064455580. The cubic root of 16421998 is about 254.1803645877.

The spelling of 16421998 in words is "sixteen million, four hundred twenty-one thousand, nine hundred ninety-eight".