16421680 has 40 divisors (see below), whose sum is σ = 41653584. Its totient is φ = 5971200.

The previous prime is 16421623. The next prime is 16421683. The reversal of 16421680 is 8612461.

16421680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421683) 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, 8451 + ... + 10210.

Almost surely, 2^16421680 is an apocalyptic number.

16421680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16421680 is an abundant number, since it is smaller than the sum of its proper divisors (25231904).

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

16421680 is a wasteful number, since it uses less digits than its factorization.

16421680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18685 (or 18679 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 16421680 is about 4052.3672094222. The cubic root of 16421680 is about 254.1787239047.

The spelling of 16421680 in words is "sixteen million, four hundred twenty-one thousand, six hundred eighty".