21745382 has 16 divisors (see below), whose sum is σ = 33230400. Its totient is φ = 10670400.

The previous prime is 21745379. The next prime is 21745387. The reversal of 21745382 is 28354712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745387) 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, 35882 + ... + 36482.

It is an arithmetic number, because the mean of its divisors is an integer number (2076900).

Almost surely, 2^21745382 is an apocalyptic number.

21745382 is a deficient number, since it is larger than the sum of its proper divisors (11485018).

21745382 is a wasteful number, since it uses less digits than its factorization.

21745382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its digits is 13440, while the sum is 32.

The square root of 21745382 is about 4663.1943986928. The cubic root of 21745382 is about 279.1187514507.

The spelling of 21745382 in words is "twenty-one million, seven hundred forty-five thousand, three hundred eighty-two".