21473875 has 16 divisors (see below), whose sum is σ = 27529632. Its totient is φ = 16711200.

The previous prime is 21473867. The next prime is 21473909. The reversal of 21473875 is 57837412.

It is not a de Polignac number, because 21473875 - 2³ = 21473867 is a prime.

It is a super-2 number, since 2×21473875² = 922254615031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 2304 + ... + 6946.

It is an arithmetic number, because the mean of its divisors is an integer number (1720602).

Almost surely, 2^21473875 is an apocalyptic number.

21473875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21473875 is a deficient number, since it is larger than the sum of its proper divisors (6055757).

21473875 is an equidigital number, since it uses as much as digits as its factorization.

21473875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695 (or 4685 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 21473875 is about 4633.9912602421. The cubic root of 21473875 is about 277.9522156194.

The spelling of 21473875 in words is "twenty-one million, four hundred seventy-three thousand, eight hundred seventy-five".