21113448 has 48 divisors (see below), whose sum is σ = 55211520. Its totient is φ = 6727776.

The previous prime is 21113447. The next prime is 21113459. The reversal of 21113448 is 84431112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21113441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11865 + ... + 13527.

It is an arithmetic number, because the mean of its divisors is an integer number (1150240).

Almost surely, 2^21113448 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 21113448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27605760).

21113448 is an abundant number, since it is smaller than the sum of its proper divisors (34098072).

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

21113448 is a wasteful number, since it uses less digits than its factorization.

21113448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1691 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 21113448 is about 4594.9372139345. The cubic root of 21113448 is about 276.3883422207.

The spelling of 21113448 in words is "twenty-one million, one hundred thirteen thousand, four hundred forty-eight".