21974016 has 88 divisors (see below), whose sum is σ = 61311744. Its totient is φ = 6983680.

The previous prime is 21973981. The next prime is 21974021. The reversal of 21974016 is 61047912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70501 + ... + 70811.

Almost surely, 2^21974016 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 21974016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30655872).

21974016 is an abundant number, since it is smaller than the sum of its proper divisors (39337728).

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

21974016 is a wasteful number, since it uses less digits than its factorization.

21974016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21974016 is about 4687.6450377562. The cubic root of 21974016 is about 280.0935741668.

The spelling of 21974016 in words is "twenty-one million, nine hundred seventy-four thousand, sixteen".