21867488 has 24 divisors (see below), whose sum is σ = 43224552. Its totient is φ = 10889856.

The previous prime is 21867487. The next prime is 21867497. The reversal of 21867488 is 88476812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867487) 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 3 ways as a sum of consecutive naturals, for example, 7631 + ... + 10097.

It is an arithmetic number, because the mean of its divisors is an integer number (1801023).

Almost surely, 2^21867488 is an apocalyptic number.

It is an amenable number.

21867488 is a deficient number, since it is larger than the sum of its proper divisors (21357064).

21867488 is a wasteful number, since it uses less digits than its factorization.

21867488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754 (or 2746 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 21867488 is about 4676.2685979315. The cubic root of 21867488 is about 279.6402181738.

The spelling of 21867488 in words is "twenty-one million, eight hundred sixty-seven thousand, four hundred eighty-eight".