21334448 has 20 divisors (see below), whose sum is σ = 42669888. Its totient is φ = 10322880.

The previous prime is 21334447. The next prime is 21334451. The reversal of 21334448 is 84443312.

21334448 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21334448.

It is not an unprimeable number, because it can be changed into a prime (21334447) 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, 21011 + ... + 22002.

Almost surely, 2^21334448 is an apocalyptic number.

It is an amenable number.

21334448 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21334448 is a wasteful number, since it uses less digits than its factorization.

21334448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43052 (or 43046 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 21334448 is about 4618.9228181471. The cubic root of 21334448 is about 277.3493400730.

The spelling of 21334448 in words is "twenty-one million, three hundred thirty-four thousand, four hundred forty-eight".