21924216 has 32 divisors (see below), whose sum is σ = 60901200. Its totient is φ = 7308000.

The previous prime is 21924211. The next prime is 21924241. The reversal of 21924216 is 61242912.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21924216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924211) 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, 50535 + ... + 50966.

Almost surely, 2^21924216 is an apocalyptic number.

It is an amenable number.

21924216 is an abundant number, since it is smaller than the sum of its proper divisors (38976984).

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

21924216 is a wasteful number, since it uses less digits than its factorization.

21924216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101516 (or 101506 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21924216 is about 4682.3301891259. The cubic root of 21924216 is about 279.8818208757.

The spelling of 21924216 in words is "twenty-one million, nine hundred twenty-four thousand, two hundred sixteen".