21668933732331 has 8 divisors (see below), whose sum is σ = 28891951981200. Its totient is φ = 14445935652512.

The previous prime is 21668933732309. The next prime is 21668933732351. The reversal of 21668933732331 is 13323733986612.

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 21668933732331 - 2⁷ = 21668933732203 is a prime.

It is a super-2 number, since 2×21668933732331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21668933732351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2326440 + ... + 6982133.

It is an arithmetic number, because the mean of its divisors is an integer number (3611493997650).

Almost surely, 2^{21668933732331} is an apocalyptic number.

21668933732331 is a deficient number, since it is larger than the sum of its proper divisors (7223018248869).

21668933732331 is an equidigital number, since it uses as much as digits as its factorization.

21668933732331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084525.

The product of its digits is 17635968, while the sum is 57.

The spelling of 21668933732331 in words is "twenty-one trillion, six hundred sixty-eight billion, nine hundred thirty-three million, seven hundred thirty-two thousand, three hundred thirty-one".