21152328 has 32 divisors (see below), whose sum is σ = 53144160. Its totient is φ = 7015680.

The previous prime is 21152321. The next prime is 21152333. The reversal of 21152328 is 82325112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21152298 and 21152307.

It is not an unprimeable number, because it can be changed into a prime (21152321) 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, 2976 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (1660755).

Almost surely, 2^21152328 is an apocalyptic number.

It is an amenable number.

21152328 is an abundant number, since it is smaller than the sum of its proper divisors (31991832).

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

21152328 is a wasteful number, since it uses less digits than its factorization.

21152328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4393 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 21152328 is about 4599.1660113547. The cubic root of 21152328 is about 276.5578927574.

The spelling of 21152328 in words is "twenty-one million, one hundred fifty-two thousand, three hundred twenty-eight".