21916674 has 48 divisors (see below), whose sum is σ = 51487800. Its totient is φ = 6697728.

The previous prime is 21916669. The next prime is 21916753. The reversal of 21916674 is 47661912.

It can be written as a sum of positive squares in 4 ways, for example, as 21762225 + 154449 = 4665^2 + 393^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53382 + ... + 53790.

Almost surely, 2^21916674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21916674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25743900).

21916674 is an abundant number, since it is smaller than the sum of its proper divisors (29571126).

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

21916674 is a wasteful number, since it uses less digits than its factorization.

21916674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 656 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21916674 is about 4681.5247516167. The cubic root of 21916674 is about 279.8497237828.

The spelling of 21916674 in words is "twenty-one million, nine hundred sixteen thousand, six hundred seventy-four".