21867416 has 8 divisors (see below), whose sum is σ = 41001420. Its totient is φ = 10933704.

The previous prime is 21867403. The next prime is 21867427. The reversal of 21867416 is 61476812.

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

It is a congruent number.

It is an unprimeable number.

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, 1366706 + ... + 1366721.

Almost surely, 2^21867416 is an apocalyptic number.

It is an amenable number.

21867416 is a deficient number, since it is larger than the sum of its proper divisors (19134004).

21867416 is a wasteful number, since it uses less digits than its factorization.

21867416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733433 (or 2733429 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 21867416 is about 4676.2608994794. The cubic root of 21867416 is about 279.6399112628.

The spelling of 21867416 in words is "twenty-one million, eight hundred sixty-seven thousand, four hundred sixteen".