21652832 has 48 divisors (see below), whose sum is σ = 46049472. Its totient is φ = 9984000.

The previous prime is 21652831. The next prime is 21652843. The reversal of 21652832 is 23825612.

It is a junction number, because it is equal to n+sod(n) for n = 21652795 and 21652804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652831) 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, 28457 + ... + 29207.

It is an arithmetic number, because the mean of its divisors is an integer number (959364).

Almost surely, 2^21652832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21652832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23024736).

21652832 is an abundant number, since it is smaller than the sum of its proper divisors (24396640).

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

21652832 is a wasteful number, since it uses less digits than its factorization.

21652832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 823 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 21652832 is about 4653.2603623696. The cubic root of 21652832 is about 278.7222047935.

The spelling of 21652832 in words is "twenty-one million, six hundred fifty-two thousand, eight hundred thirty-two".