21112675 has 6 divisors (see below), whose sum is σ = 26179748. Its totient is φ = 16890120.

The previous prime is 21112673. The next prime is 21112711. The reversal of 21112675 is 57621112.

It is not a de Polignac number, because 21112675 - 2¹ = 21112673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 844507 = 21112675 / (2 + 1 + 1 + 1 + 2 + 6 + 7 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 422229 + ... + 422278.

Almost surely, 2^21112675 is an apocalyptic number.

21112675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21112675 is a deficient number, since it is larger than the sum of its proper divisors (5067073).

21112675 is an equidigital number, since it uses as much as digits as its factorization.

21112675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844517 (or 844512 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 21112675 is about 4594.8530988488. The cubic root of 21112675 is about 276.3849691605.

Adding to 21112675 its reverse (57621112), we get a palindrome (78733787).

The spelling of 21112675 in words is "twenty-one million, one hundred twelve thousand, six hundred seventy-five".