21227875 has 8 divisors (see below), whose sum is σ = 26492544. Its totient is φ = 16982200.

The previous prime is 21227867. The next prime is 21227887. The reversal of 21227875 is 57872212.

It is not a de Polignac number, because 21227875 - 2³ = 21227867 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21227875.

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 7 ways as a sum of consecutive naturals, for example, 84787 + ... + 85036.

It is an arithmetic number, because the mean of its divisors is an integer number (3311568).

Almost surely, 2^21227875 is an apocalyptic number.

21227875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21227875 is a deficient number, since it is larger than the sum of its proper divisors (5264669).

21227875 is an equidigital number, since it uses as much as digits as its factorization.

21227875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169838 (or 169828 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 21227875 is about 4607.3718104794. The cubic root of 21227875 is about 276.8867500920.

The spelling of 21227875 in words is "twenty-one million, two hundred twenty-seven thousand, eight hundred seventy-five".