21334160 has 20 divisors (see below), whose sum is σ = 49602108. Its totient is φ = 8533632.

The previous prime is 21334153. The next prime is 21334171. The reversal of 21334160 is 6143312.

It can be written as a sum of positive squares in 2 ways, for example, as 10549504 + 10784656 = 3248^2 + 3284^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133259 + ... + 133418.

Almost surely, 2^21334160 is an apocalyptic number.

21334160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334160 is an abundant number, since it is smaller than the sum of its proper divisors (28267948).

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

21334160 is a wasteful number, since it uses less digits than its factorization.

21334160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266690 (or 266684 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21334160 is about 4618.8916419418. The cubic root of 21334160 is about 277.3480920606.

Adding to 21334160 its reverse (6143312), we get a palindrome (27477472).

The spelling of 21334160 in words is "twenty-one million, three hundred thirty-four thousand, one hundred sixty".