21241632 has 48 divisors (see below), whose sum is σ = 56125440. Its totient is φ = 7034112.

The previous prime is 21241631. The next prime is 21241643. The reversal of 21241632 is 23614212.

It is a tau number, because it is divible by the number of its divisors (48).

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 = 21241599 and 21241608.

It is not an unprimeable number, because it can be changed into a prime (21241631) 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, 15969 + ... + 17247.

It is an arithmetic number, because the mean of its divisors is an integer number (1169280).

Almost surely, 2^21241632 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 21241632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28062720).

21241632 is an abundant number, since it is smaller than the sum of its proper divisors (34883808).

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

21241632 is a wasteful number, since it uses less digits than its factorization.

21241632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1457 counting only the distinct ones).

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

The square root of 21241632 is about 4608.8645022391. The cubic root of 21241632 is about 276.9465505268.

Adding to 21241632 its reverse (23614212), we get a palindrome (44855844).

The spelling of 21241632 in words is "twenty-one million, two hundred forty-one thousand, six hundred thirty-two".