21466875 has 30 divisors (see below), whose sum is σ = 36104068. Its totient is φ = 11342000.

The previous prime is 21466859. The next prime is 21466883. The reversal of 21466875 is 57866412.

It is not a de Polignac number, because 21466875 - 2⁴ = 21466859 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 200572 + ... + 200678.

Almost surely, 2^21466875 is an apocalyptic number.

21466875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21466875 is a deficient number, since it is larger than the sum of its proper divisors (14637193).

21466875 is an frugal number, since it uses more digits than its factorization.

21466875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 115 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 21466875 is about 4633.2359102467. The cubic root of 21466875 is about 277.9220102814.

The spelling of 21466875 in words is "twenty-one million, four hundred sixty-six thousand, eight hundred seventy-five".