21984594 has 16 divisors (see below), whose sum is σ = 44526720. Its totient is φ = 7235280.

The previous prime is 21984593. The next prime is 21984631. The reversal of 21984594 is 49548912.

It is not an unprimeable number, because it can be changed into a prime (21984593) 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, 22717 + ... + 23664.

It is an arithmetic number, because the mean of its divisors is an integer number (2782920).

Almost surely, 2^21984594 is an apocalyptic number.

21984594 is an abundant number, since it is smaller than the sum of its proper divisors (22542126).

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

21984594 is a wasteful number, since it uses less digits than its factorization.

21984594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46465.

The product of its digits is 103680, while the sum is 42.

The square root of 21984594 is about 4688.7731870928. The cubic root of 21984594 is about 280.1385114014.

It can be divided in two parts, 21984 and 594, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 21984594 in words is "twenty-one million, nine hundred eighty-four thousand, five hundred ninety-four".