21675107 has 4 divisors (see below), whose sum is σ = 22374336. Its totient is φ = 20975880.

The previous prime is 21675091. The next prime is 21675109. The reversal of 21675107 is 70157612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21675107 - 2⁴ = 21675091 is a prime.

It is a super-2 number, since 2×21675107² = 939620526922898, which contains 22 as substring.

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 21675107.

It is not an unprimeable number, because it can be changed into a prime (21675109) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 349568 + ... + 349629.

It is an arithmetic number, because the mean of its divisors is an integer number (5593584).

Almost surely, 2^21675107 is an apocalyptic number.

21675107 is a deficient number, since it is larger than the sum of its proper divisors (699229).

21675107 is an equidigital number, since it uses as much as digits as its factorization.

21675107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699228.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 21675107 is about 4655.6532302138. The cubic root of 21675107 is about 278.8177490215.

The spelling of 21675107 in words is "twenty-one million, six hundred seventy-five thousand, one hundred seven".