16421888 has 88 divisors (see below), whose sum is σ = 39302400. Its totient is φ = 6709248.

The previous prime is 16421887. The next prime is 16421897. The reversal of 16421888 is 88812461.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421887) 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, 207833 + ... + 207911.

Almost surely, 2^16421888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16421888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19651200).

16421888 is an abundant number, since it is smaller than the sum of its proper divisors (22880512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16421888 is an equidigital number, since it uses as much as digits as its factorization.

16421888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 117 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 16421888 is about 4052.3928733527. The cubic root of 16421888 is about 254.1797970582.

The spelling of 16421888 in words is "sixteen million, four hundred twenty-one thousand, eight hundred eighty-eight".