21660650107 has 8 divisors (see below), whose sum is σ = 22209549120. Its totient is φ = 21113804040.

The previous prime is 21660650093. The next prime is 21660650129. The reversal of 21660650107 is 70105606612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21660650107 - 2¹¹ = 21660648059 is a prime.

It is a super-2 number, since 2×21660650107² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21660150107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491857 + ... + 534082.

It is an arithmetic number, because the mean of its divisors is an integer number (2776193640).

Almost surely, 2^21660650107 is an apocalyptic number.

21660650107 is a deficient number, since it is larger than the sum of its proper divisors (548899013).

21660650107 is a wasteful number, since it uses less digits than its factorization.

21660650107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026473.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21660650107 in words is "twenty-one billion, six hundred sixty million, six hundred fifty thousand, one hundred seven".