21086448 has 80 divisors (see below), whose sum is σ = 57901056. Its totient is φ = 6600960.

The previous prime is 21086431. The next prime is 21086453. The reversal of 21086448 is 84468012.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 54865 + ... + 55247.

Almost surely, 2^21086448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21086448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28950528).

21086448 is an abundant number, since it is smaller than the sum of its proper divisors (36814608).

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

21086448 is a wasteful number, since it uses less digits than its factorization.

21086448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 21086448 is about 4591.9982578394. The cubic root of 21086448 is about 276.2704762912.

The spelling of 21086448 in words is "twenty-one million, eighty-six thousand, four hundred forty-eight".