21446328 has 32 divisors (see below), whose sum is σ = 53922960. Its totient is φ = 7107840.

The previous prime is 21446317. The next prime is 21446329. The reversal of 21446328 is 82364412.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21446295 and 21446304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876 + ... + 6812.

Almost surely, 2^21446328 is an apocalyptic number.

It is an amenable number.

21446328 is an abundant number, since it is smaller than the sum of its proper divisors (32476632).

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

21446328 is a wasteful number, since it uses less digits than its factorization.

21446328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127 (or 5123 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21446328 is about 4631.0180306278. The cubic root of 21446328 is about 277.8333110422.

The spelling of 21446328 in words is "twenty-one million, four hundred forty-six thousand, three hundred twenty-eight".