21334480 has 20 divisors (see below), whose sum is σ = 49602852. Its totient is φ = 8533760.

The previous prime is 21334463. The next prime is 21334487. The reversal of 21334480 is 8443312.

It can be written as a sum of positive squares in 2 ways, for example, as 10810944 + 10523536 = 3288^2 + 3244^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133261 + ... + 133420.

Almost surely, 2^21334480 is an apocalyptic number.

21334480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334480 is an abundant number, since it is smaller than the sum of its proper divisors (28268372).

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

21334480 is a wasteful number, since it uses less digits than its factorization.

21334480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266694 (or 266688 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21334480 is about 4618.9262821569. The cubic root of 21334480 is about 277.3494787404.

Adding to 21334480 its reverse (8443312), we get a palindrome (29777792).

The spelling of 21334480 in words is "twenty-one million, three hundred thirty-four thousand, four hundred eighty".