21843672 has 32 divisors (see below), whose sum is σ = 54935280. Its totient is φ = 7237760.

The previous prime is 21843671. The next prime is 21843677. The reversal of 21843672 is 27634812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21843671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1522 + ... + 6782.

Almost surely, 2^21843672 is an apocalyptic number.

It is an amenable number.

21843672 is an abundant number, since it is smaller than the sum of its proper divisors (33091608).

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

21843672 is a wasteful number, since it uses less digits than its factorization.

21843672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443 (or 5439 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 21843672 is about 4673.7214294393. The cubic root of 21843672 is about 279.5386620694.

The spelling of 21843672 in words is "twenty-one million, eight hundred forty-three thousand, six hundred seventy-two".