21343168 has 112 divisors (see below), whose sum is σ = 54425088. Its totient is φ = 8064000.

The previous prime is 21343163. The next prime is 21343187. The reversal of 21343168 is 86134312.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300573 + ... + 300643.

Almost surely, 2^21343168 is an apocalyptic number.

21343168 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 21343168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27212544).

21343168 is an abundant number, since it is smaller than the sum of its proper divisors (33081920).

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

21343168 is a wasteful number, since it uses less digits than its factorization.

21343168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 152 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 21343168 is about 4619.8666647426. The cubic root of 21343168 is about 277.3871217992.

The spelling of 21343168 in words is "twenty-one million, three hundred forty-three thousand, one hundred sixty-eight".