21984426 has 16 divisors (see below), whose sum is σ = 48854400. Its totient is φ = 7328124.

The previous prime is 21984421. The next prime is 21984449. The reversal of 21984426 is 62448912.

It is not an unprimeable number, because it can be changed into a prime (21984421) 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, 203506 + ... + 203613.

It is an arithmetic number, because the mean of its divisors is an integer number (3053400).

Almost surely, 2^21984426 is an apocalyptic number.

21984426 is an abundant number, since it is smaller than the sum of its proper divisors (26869974).

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

21984426 is a wasteful number, since it uses less digits than its factorization.

21984426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407130 (or 407124 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21984426 is about 4688.7552719245. The cubic root of 21984426 is about 280.1377978200.

The spelling of 21984426 in words is "twenty-one million, nine hundred eighty-four thousand, four hundred twenty-six".