21730682 has 4 divisors (see below), whose sum is σ = 32596026. Its totient is φ = 10865340.

The previous prime is 21730663. The next prime is 21730693. The reversal of 21730682 is 28603712.

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., 16982641 + 4748041 = 4121^2 + 2179^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5432669 + ... + 5432672.

Almost surely, 2^21730682 is an apocalyptic number.

21730682 is a deficient number, since it is larger than the sum of its proper divisors (10865344).

21730682 is a wasteful number, since it uses less digits than its factorization.

21730682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10865343.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21730682 is about 4661.6179594643. The cubic root of 21730682 is about 279.0558419932.

The spelling of 21730682 in words is "twenty-one million, seven hundred thirty thousand, six hundred eighty-two".