21296416 has 24 divisors (see below), whose sum is σ = 44135280. Its totient is φ = 10087488.

The previous prime is 21296399. The next prime is 21296417. The reversal of 21296416 is 61469212.

It is not an unprimeable number, because it can be changed into a prime (21296417) 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, 16906 + ... + 18121.

It is an arithmetic number, because the mean of its divisors is an integer number (1838970).

Almost surely, 2^21296416 is an apocalyptic number.

It is an amenable number.

21296416 is an abundant number, since it is smaller than the sum of its proper divisors (22838864).

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

21296416 is a wasteful number, since it uses less digits than its factorization.

21296416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35056 (or 35048 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21296416 is about 4614.8040045055. The cubic root of 21296416 is about 277.1844358107.

It can be divided in two parts, 21296 and 416, that added together give a palindrome (21712).

The spelling of 21296416 in words is "twenty-one million, two hundred ninety-six thousand, four hundred sixteen".