21198875 has 8 divisors (see below), whose sum is σ = 26456352. Its totient is φ = 16959000.

The previous prime is 21198869. The next prime is 21198907. The reversal of 21198875 is 57889112.

It is not a de Polignac number, because 21198875 - 2¹⁰ = 21197851 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, 84671 + ... + 84920.

It is an arithmetic number, because the mean of its divisors is an integer number (3307044).

Almost surely, 2^21198875 is an apocalyptic number.

21198875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21198875 is a deficient number, since it is larger than the sum of its proper divisors (5257477).

21198875 is an equidigital number, since it uses as much as digits as its factorization.

21198875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169606 (or 169596 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 21198875 is about 4604.2236044745. The cubic root of 21198875 is about 276.7606050261.

The spelling of 21198875 in words is "twenty-one million, one hundred ninety-eight thousand, eight hundred seventy-five".