21927416 has 64 divisors (see below), whose sum is σ = 51425280. Its totient is φ = 8547840.

The previous prime is 21927413. The next prime is 21927431. The reversal of 21927416 is 61472912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29141 + ... + 29883.

It is an arithmetic number, because the mean of its divisors is an integer number (803520).

Almost surely, 2^21927416 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 21927416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25712640).

21927416 is an abundant number, since it is smaller than the sum of its proper divisors (29497864).

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

21927416 is a wasteful number, since it uses less digits than its factorization.

21927416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 800 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 21927416 is about 4682.6718868612. The cubic root of 21927416 is about 279.8954371475.

The spelling of 21927416 in words is "twenty-one million, nine hundred twenty-seven thousand, four hundred sixteen".