21748682 has 4 divisors (see below), whose sum is σ = 32623026. Its totient is φ = 10874340.

The previous prime is 21748651. The next prime is 21748687. The reversal of 21748682 is 28684712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13169641 + 8579041 = 3629^2 + 2929^2 .

It is not an unprimeable number, because it can be changed into a prime (21748687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5437169 + ... + 5437172.

Almost surely, 2^21748682 is an apocalyptic number.

21748682 is a deficient number, since it is larger than the sum of its proper divisors (10874344).

21748682 is a wasteful number, since it uses less digits than its factorization.

21748682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10874343.

The product of its digits is 43008, while the sum is 38.

The square root of 21748682 is about 4663.5482199716. The cubic root of 21748682 is about 279.1328700851.

The spelling of 21748682 in words is "twenty-one million, seven hundred forty-eight thousand, six hundred eighty-two".