21115682 has 8 divisors (see below), whose sum is σ = 36198336. Its totient is φ = 9049572.

The previous prime is 21115657. The next prime is 21115723. The reversal of 21115682 is 28651112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754118 + ... + 754145.

It is an arithmetic number, because the mean of its divisors is an integer number (4524792).

Almost surely, 2^21115682 is an apocalyptic number.

21115682 is a deficient number, since it is larger than the sum of its proper divisors (15082654).

21115682 is a wasteful number, since it uses less digits than its factorization.

21115682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508272.

The product of its digits is 960, while the sum is 26.

The square root of 21115682 is about 4595.1803011416. The cubic root of 21115682 is about 276.3980900330.

Adding to 21115682 its reverse (28651112), we get a palindrome (49766794).

The spelling of 21115682 in words is "twenty-one million, one hundred fifteen thousand, six hundred eighty-two".