21732344 has 8 divisors (see below), whose sum is σ = 40748160. Its totient is φ = 10866168.

The previous prime is 21732343. The next prime is 21732349. The reversal of 21732344 is 44323712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358264 + ... + 1358279.

It is an arithmetic number, because the mean of its divisors is an integer number (5093520).

Almost surely, 2^21732344 is an apocalyptic number.

It is an amenable number.

21732344 is a deficient number, since it is larger than the sum of its proper divisors (19015816).

21732344 is a wasteful number, since it uses less digits than its factorization.

21732344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716549 (or 2716545 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 21732344 is about 4661.7962203425. The cubic root of 21732344 is about 279.0629560357.

The spelling of 21732344 in words is "twenty-one million, seven hundred thirty-two thousand, three hundred forty-four".