21041666682 has 8 divisors (see below), whose sum is σ = 42083333376. Its totient is φ = 7013888892.

The previous prime is 21041666651. The next prime is 21041666689. The reversal of 21041666682 is 28666614012.

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

21041666682 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21041666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1753472218 + ... + 1753472229.

It is an arithmetic number, because the mean of its divisors is an integer number (5260416672).

Almost surely, 2^21041666682 is an apocalyptic number.

21041666682 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21041666682 is a wasteful number, since it uses less digits than its factorization.

21041666682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506944452.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 21041666682 in words is "twenty-one billion, forty-one million, six hundred sixty-six thousand, six hundred eighty-two".