21246328 has 32 divisors (see below), whose sum is σ = 43642800. Its totient is φ = 9651712.

The previous prime is 21246317. The next prime is 21246341. The reversal of 21246328 is 82364212.

It is a junction number, because it is equal to n+sod(n) for n = 21246296 and 21246305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1251 + ... + 6637.

Almost surely, 2^21246328 is an apocalyptic number.

It is an amenable number.

21246328 is an abundant number, since it is smaller than the sum of its proper divisors (22396472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21246328 is a wasteful number, since it uses less digits than its factorization.

21246328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439 (or 5435 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21246328 is about 4609.3739271185. The cubic root of 21246328 is about 276.9669577029.

The spelling of 21246328 in words is "twenty-one million, two hundred forty-six thousand, three hundred twenty-eight".