21660184682 has 8 divisors (see below), whose sum is σ = 32490917316. Its totient is φ = 10829878912.

The previous prime is 21660184673. The next prime is 21660184691. The reversal of 21660184682 is 28648106612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21660184673) and next prime (21660184691).

It can be written as a sum of positive squares in 2 ways, for example, as 19077410641 + 2582774041 = 138121^2 + 50821^2 .

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

It is a super-2 number, since 2×21660184682² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101018 + ... + 231354.

Almost surely, 2^21660184682 is an apocalyptic number.

21660184682 is a deficient number, since it is larger than the sum of its proper divisors (10830732634).

21660184682 is a wasteful number, since it uses less digits than its factorization.

21660184682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213432.

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 21660184682 in words is "twenty-one billion, six hundred sixty million, one hundred eighty-four thousand, six hundred eighty-two".