21943672 has 16 divisors (see below), whose sum is σ = 41666400. Its totient is φ = 10832640.

The previous prime is 21943637. The next prime is 21943673. The reversal of 21943672 is 27634912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16729 + ... + 17992.

It is an arithmetic number, because the mean of its divisors is an integer number (2604150).

Almost surely, 2^21943672 is an apocalyptic number.

It is an amenable number.

21943672 is a deficient number, since it is larger than the sum of its proper divisors (19722728).

21943672 is a wasteful number, since it uses less digits than its factorization.

21943672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34806 (or 34802 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21943672 is about 4684.4073264395. The cubic root of 21943672 is about 279.9645873582.

The spelling of 21943672 in words is "twenty-one million, nine hundred forty-three thousand, six hundred seventy-two".