21867875 has 8 divisors (see below), whose sum is σ = 27291264. Its totient is φ = 17494200.

The previous prime is 21867869. The next prime is 21867913. The reversal of 21867875 is 57876812.

It is not a de Polignac number, because 21867875 - 2¹⁰ = 21866851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87347 + ... + 87596.

It is an arithmetic number, because the mean of its divisors is an integer number (3411408).

Almost surely, 2^21867875 is an apocalyptic number.

21867875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21867875 is a deficient number, since it is larger than the sum of its proper divisors (5423389).

21867875 is an equidigital number, since it uses as much as digits as its factorization.

21867875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174958 (or 174948 counting only the distinct ones).

The product of its digits is 188160, while the sum is 44.

The square root of 21867875 is about 4676.3099768942. The cubic root of 21867875 is about 279.6418678089.

The spelling of 21867875 in words is "twenty-one million, eight hundred sixty-seven thousand, eight hundred seventy-five".