21494016 has 108 divisors (see below), whose sum is σ = 65367120. Its totient is φ = 6773760.

The previous prime is 21494009. The next prime is 21494027. The reversal of 21494016 is 61049412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43531 + ... + 44021.

Almost surely, 2^21494016 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 21494016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32683560).

21494016 is an abundant number, since it is smaller than the sum of its proper divisors (43873104).

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

21494016 is a wasteful number, since it uses less digits than its factorization.

21494016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 515 counting only the distinct ones).

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

The square root of 21494016 is about 4636.1639315279. The cubic root of 21494016 is about 278.0390884084.

The spelling of 21494016 in words is "twenty-one million, four hundred ninety-four thousand, sixteen".