21361328 has 20 divisors (see below), whose sum is σ = 42398328. Its totient is φ = 10419840.

The previous prime is 21361303. The next prime is 21361391. The reversal of 21361328 is 82316312.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21361297 and 21361306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15626 + ... + 16937.

Almost surely, 2^21361328 is an apocalyptic number.

It is an amenable number.

21361328 is a deficient number, since it is larger than the sum of its proper divisors (21037000).

21361328 is a wasteful number, since it uses less digits than its factorization.

21361328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32612 (or 32606 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21361328 is about 4621.8316715346. The cubic root of 21361328 is about 277.4657718246.

The spelling of 21361328 in words is "twenty-one million, three hundred sixty-one thousand, three hundred twenty-eight".