21416448 has 80 divisors (see below), whose sum is σ = 58139136. Its totient is φ = 7004160.

The previous prime is 21416431. The next prime is 21416449. The reversal of 21416448 is 84461412.

21416448 = T₄₆₇ + T₄₆₈ + ... + T₆₁₂.

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 (21416449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112033 + ... + 112223.

Almost surely, 2^21416448 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 21416448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29069568).

21416448 is an abundant number, since it is smaller than the sum of its proper divisors (36722688).

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

21416448 is an equidigital number, since it uses as much as digits as its factorization.

21416448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 269 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21416448 is about 4627.7908336484. The cubic root of 21416448 is about 277.7042210688.

The spelling of 21416448 in words is "twenty-one million, four hundred sixteen thousand, four hundred forty-eight".