21168075 has 12 divisors (see below), whose sum is σ = 34998008. Its totient is φ = 11289600.

The previous prime is 21168053. The next prime is 21168101. The reversal of 21168075 is 57086112.

It is not a de Polignac number, because 21168075 - 2⁹ = 21167563 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141046 + ... + 141195.

Almost surely, 2^21168075 is an apocalyptic number.

21168075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21168075 is a deficient number, since it is larger than the sum of its proper divisors (13829933).

21168075 is a wasteful number, since it uses less digits than its factorization.

21168075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282254 (or 282249 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 21168075 is about 4600.8776336695. The cubic root of 21168075 is about 276.6265042264.

It can be divided in two parts, 211 and 68075, that added together give a palindrome (68286).

The spelling of 21168075 in words is "twenty-one million, one hundred sixty-eight thousand, seventy-five".