21867224 has 8 divisors (see below), whose sum is σ = 41001060. Its totient is φ = 10933608.

The previous prime is 21867221. The next prime is 21867277. The reversal of 21867224 is 42276812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867221) 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 as a sum of consecutive naturals, namely, 1366694 + ... + 1366709.

Almost surely, 2^21867224 is an apocalyptic number.

It is an amenable number.

21867224 is a deficient number, since it is larger than the sum of its proper divisors (19133836).

21867224 is a wasteful number, since it uses less digits than its factorization.

21867224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733409 (or 2733405 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 21867224 is about 4676.2403702120. The cubic root of 21867224 is about 279.6390928302.

The spelling of 21867224 in words is "twenty-one million, eight hundred sixty-seven thousand, two hundred twenty-four".