21344160 has 96 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 5577728.

The previous prime is 21344159. The next prime is 21344173. The reversal of 21344160 is 6144312.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21344160² = 911146332211200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25021 + ... + 25859.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^21344160 is an apocalyptic number.

21344160 is a gapful number since it is divisible by the number (20) 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 21344160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292160).

21344160 is an abundant number, since it is smaller than the sum of its proper divisors (47240160).

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

21344160 is a wasteful number, since it uses less digits than its factorization.

21344160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21344160 is about 4619.9740259010. The cubic root of 21344160 is about 277.3914192519.

Adding to 21344160 its reverse (6144312), we get a palindrome (27488472).

The spelling of 21344160 in words is "twenty-one million, three hundred forty-four thousand, one hundred sixty".