21169328 has 20 divisors (see below), whose sum is σ = 42125280. Its totient is φ = 10298304.

The previous prime is 21169321. The next prime is 21169331. The reversal of 21169328 is 82396112.

It is a super-4 number, since 4×21169328⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21169294 and 21169303.

It is not an unprimeable number, because it can be changed into a prime (21169321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17288 + ... + 18471.

It is an arithmetic number, because the mean of its divisors is an integer number (2106264).

Almost surely, 2^21169328 is an apocalyptic number.

It is an amenable number.

21169328 is a deficient number, since it is larger than the sum of its proper divisors (20955952).

21169328 is a wasteful number, since it uses less digits than its factorization.

21169328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35804 (or 35798 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 21169328 is about 4601.0138013268. The cubic root of 21169328 is about 276.6319622281.

The spelling of 21169328 in words is "twenty-one million, one hundred sixty-nine thousand, three hundred twenty-eight".