16021668 has 48 divisors (see below), whose sum is σ = 41570816. Its totient is φ = 4769280.

The previous prime is 16021651. The next prime is 16021669. The reversal of 16021668 is 86612061.

16021668 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16021669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3180 + ... + 6492.

Almost surely, 2^16021668 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 16021668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20785408).

16021668 is an abundant number, since it is smaller than the sum of its proper divisors (25549148).

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

16021668 is a wasteful number, since it uses less digits than its factorization.

16021668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 16021668 is about 4002.7075836239. The cubic root of 16021668 is about 252.0979085411.

The spelling of 16021668 in words is "sixteen million, twenty-one thousand, six hundred sixty-eight".