21941632 has 64 divisors (see below), whose sum is σ = 47368800. Its totient is φ = 10092544.

The previous prime is 21941581. The next prime is 21941651. The reversal of 21941632 is 23614912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21941632.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85248 + ... + 85504.

Almost surely, 2^21941632 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 21941632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23684400).

21941632 is an abundant number, since it is smaller than the sum of its proper divisors (25427168).

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

21941632 is a wasteful number, since it uses less digits than its factorization.

21941632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 311 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 21941632 is about 4684.1895777178. The cubic root of 21941632 is about 279.9559114256.

The spelling of 21941632 in words is "twenty-one million, nine hundred forty-one thousand, six hundred thirty-two".