21932064 has 288 divisors, whose sum is σ = 83026944. Its totient is φ = 5322240.

The previous prime is 21932063. The next prime is 21932077. The reversal of 21932064 is 46023912.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21932063) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 510027 + ... + 510069.

It is an arithmetic number, because the mean of its divisors is an integer number (288288).

Almost surely, 2^21932064 is an apocalyptic number.

21932064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21932064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41513472).

21932064 is an abundant number, since it is smaller than the sum of its proper divisors (61094880).

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

21932064 is a wasteful number, since it uses less digits than its factorization.

21932064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21932064 is about 4683.1681584158. The cubic root of 21932064 is about 279.9152124231.

Adding to 21932064 its reverse (46023912), we get a palindrome (67955976).

The spelling of 21932064 in words is "twenty-one million, nine hundred thirty-two thousand, sixty-four".