21738754 has 8 divisors (see below), whose sum is σ = 32655168. Its totient is φ = 10853700.

The previous prime is 21738751. The next prime is 21738763. The reversal of 21738754 is 45783712.

It is a sphenic number, since it is the product of 3 distinct primes.

Its product of digits (47040) is a multiple of the sum of its prime divisors (15680).

It is not an unprimeable number, because it can be changed into a prime (21738751) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6022 + ... + 8929.

It is an arithmetic number, because the mean of its divisors is an integer number (4081896).

Almost surely, 2^21738754 is an apocalyptic number.

21738754 is a deficient number, since it is larger than the sum of its proper divisors (10916414).

21738754 is a wasteful number, since it uses less digits than its factorization.

21738754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15680.

The product of its digits is 47040, while the sum is 37.

The square root of 21738754 is about 4662.4836728937. The cubic root of 21738754 is about 279.0903900715.

The spelling of 21738754 in words is "twenty-one million, seven hundred thirty-eight thousand, seven hundred fifty-four".