21461232 has 80 divisors (see below), whose sum is σ = 60357248. Its totient is φ = 6531840.

The previous prime is 21461213. The next prime is 21461233. The reversal of 21461232 is 23216412.

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 = 21461199 and 21461208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101607 + ... + 101817.

Almost surely, 2^21461232 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 21461232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30178624).

21461232 is an abundant number, since it is smaller than the sum of its proper divisors (38896016).

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

21461232 is a wasteful number, since it uses less digits than its factorization.

21461232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 392 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 21461232 is about 4632.6269005824. The cubic root of 21461232 is about 277.8976556832.

Adding to 21461232 its reverse (23216412), we get a palindrome (44677644).

The spelling of 21461232 in words is "twenty-one million, four hundred sixty-one thousand, two hundred thirty-two".