21562432 has 28 divisors (see below), whose sum is σ = 43216576. Its totient is φ = 10673280.

The previous prime is 21562427. The next prime is 21562439. The reversal of 21562432 is 23426512.

It is a junction number, because it is equal to n+sod(n) for n = 21562397 and 21562406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21562439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4957 + ... + 8227.

Almost surely, 2^21562432 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 21562432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21608288).

21562432 is an abundant number, since it is smaller than the sum of its proper divisors (21654144).

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

21562432 is a wasteful number, since it uses less digits than its factorization.

21562432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386 (or 3376 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 21562432 is about 4643.5365832520. The cubic root of 21562432 is about 278.3337777930. Note that the first 3 decimals are identical.

Adding to 21562432 its reverse (23426512), we get a palindrome (44988944).

The spelling of 21562432 in words is "twenty-one million, five hundred sixty-two thousand, four hundred thirty-two".