21344120 has 64 divisors (see below), whose sum is σ = 56678400. Its totient is φ = 7079040.

The previous prime is 21344119. The next prime is 21344131. The reversal of 21344120 is 2144312.

It is a congruent number.

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, 7451 + ... + 9909.

It is an arithmetic number, because the mean of its divisors is an integer number (885600).

Almost surely, 2^21344120 is an apocalyptic number.

21344120 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 21344120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28339200).

21344120 is an abundant number, since it is smaller than the sum of its proper divisors (35334280).

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

21344120 is a wasteful number, since it uses less digits than its factorization.

21344120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508 (or 2504 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21344120 is about 4619.9696968703. The cubic root of 21344120 is about 277.3912459700.

Adding to 21344120 its product of nonzero digits (192), we get a palindrome (21344312).

Adding to 21344120 its reverse (2144312), we get a palindrome (23488432).

The spelling of 21344120 in words is "twenty-one million, three hundred forty-four thousand, one hundred twenty".