21522432 has 96 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 6881280.

The previous prime is 21522427. The next prime is 21522439. The reversal of 21522432 is 23422512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21522399 and 21522408.

It is not an unprimeable number, because it can be changed into a prime (21522439) 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, 190408 + ... + 190520.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

Almost surely, 2^21522432 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 21522432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29877120).

21522432 is an abundant number, since it is smaller than the sum of its proper divisors (38231808).

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

21522432 is a wasteful number, since it uses less digits than its factorization.

21522432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 149 counting only the distinct ones).

The product of its digits is 960, while the sum is 21.

The square root of 21522432 is about 4639.2275219049. The cubic root of 21522432 is about 278.1615609387.

Adding to 21522432 its reverse (23422512), we get a palindrome (44944944).

The spelling of 21522432 in words is "twenty-one million, five hundred twenty-two thousand, four hundred thirty-two".