21675475 has 12 divisors (see below), whose sum is σ = 26951400. Its totient is φ = 17292800.

The previous prime is 21675473. The next prime is 21675491. The reversal of 21675475 is 57457612.

It is not a de Polignac number, because 21675475 - 2¹ = 21675473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21675473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10260 + ... + 12190.

It is an arithmetic number, because the mean of its divisors is an integer number (2245950).

Almost surely, 2^21675475 is an apocalyptic number.

21675475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21675475 is a deficient number, since it is larger than the sum of its proper divisors (5275925).

21675475 is a wasteful number, since it uses less digits than its factorization.

21675475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390 (or 2385 counting only the distinct ones).

The product of its digits is 58800, while the sum is 37.

The square root of 21675475 is about 4655.6927518899. The cubic root of 21675475 is about 278.8193269353.

The spelling of 21675475 in words is "twenty-one million, six hundred seventy-five thousand, four hundred seventy-five".