21744682 has 4 divisors (see below), whose sum is σ = 32617026. Its totient is φ = 10872340.

The previous prime is 21744631. The next prime is 21744727. The reversal of 21744682 is 28644712.

It is a happy number.

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., 19527561 + 2217121 = 4419^2 + 1489^2 .

It is a super-2 number, since 2×21744682² = 945662390562248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5436169 + ... + 5436172.

Almost surely, 2^21744682 is an apocalyptic number.

21744682 is a deficient number, since it is larger than the sum of its proper divisors (10872344).

21744682 is a wasteful number, since it uses less digits than its factorization.

21744682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10872343.

The product of its digits is 21504, while the sum is 34.

The square root of 21744682 is about 4663.1193422429. The cubic root of 21744682 is about 279.1157564053.

The spelling of 21744682 in words is "twenty-one million, seven hundred forty-four thousand, six hundred eighty-two".