21462168 has 128 divisors (see below), whose sum is σ = 68382720. Its totient is φ = 5460480.

The previous prime is 21462163. The next prime is 21462187. The reversal of 21462168 is 86126412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21462163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67546 + ... + 67862.

It is an arithmetic number, because the mean of its divisors is an integer number (534240).

Almost surely, 2^21462168 is an apocalyptic number.

21462168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21462168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34191360).

21462168 is an abundant number, since it is smaller than the sum of its proper divisors (46920552).

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

21462168 is a wasteful number, since it uses less digits than its factorization.

21462168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 373 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 21462168 is about 4632.7279220779. The cubic root of 21462168 is about 277.9016956567.

The spelling of 21462168 in words is "twenty-one million, four hundred sixty-two thousand, one hundred sixty-eight".