16421845 has 8 divisors (see below), whose sum is σ = 21497760. Its totient is φ = 11943120.

The previous prime is 16421843. The next prime is 16421849. The reversal of 16421845 is 54812461.

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

It is not a de Polignac number, because 16421845 - 2¹ = 16421843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149235 + ... + 149344.

It is an arithmetic number, because the mean of its divisors is an integer number (2687220).

Almost surely, 2^16421845 is an apocalyptic number.

It is an amenable number.

16421845 is a deficient number, since it is larger than the sum of its proper divisors (5075915).

16421845 is a wasteful number, since it uses less digits than its factorization.

16421845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298595.

The product of its digits is 7680, while the sum is 31.

The square root of 16421845 is about 4052.3875678420. The cubic root of 16421845 is about 254.1795752051.

The spelling of 16421845 in words is "sixteen million, four hundred twenty-one thousand, eight hundred forty-five".