21867248 has 30 divisors (see below), whose sum is σ = 45883224. Its totient is φ = 10091328.

The previous prime is 21867221. The next prime is 21867277. The reversal of 21867248 is 84276812.

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 in 5 ways as a sum of consecutive naturals, for example, 1340 + ... + 6747.

Almost surely, 2^21867248 is an apocalyptic number.

It is an amenable number.

21867248 is an abundant number, since it is smaller than the sum of its proper divisors (24015976).

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

21867248 is a wasteful number, since it uses less digits than its factorization.

21867248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121 (or 8102 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 21867248 is about 4676.2429363753. The cubic root of 21867248 is about 279.6391951345.

The spelling of 21867248 in words is "twenty-one million, eight hundred sixty-seven thousand, two hundred forty-eight".