21666333502043 has 8 divisors (see below), whose sum is σ = 21753309861360. Its totient is φ = 21579362352000.

The previous prime is 21666333502039. The next prime is 21666333502049. The reversal of 21666333502043 is 34020533366612.

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 21666333502043 - 2² = 21666333502039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21666333501985 and 21666333502003.

It is not an unprimeable number, because it can be changed into a prime (21666333502049) 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, 7142423 + ... + 9713231.

It is an arithmetic number, because the mean of its divisors is an integer number (2719163732670).

Almost surely, 2^{21666333502043} is an apocalyptic number.

21666333502043 is a deficient number, since it is larger than the sum of its proper divisors (86976359317).

21666333502043 is a wasteful number, since it uses less digits than its factorization.

21666333502043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604637.

The product of its (nonzero) digits is 1399680, while the sum is 44.

Adding to 21666333502043 its reverse (34020533366612), we get a palindrome (55686866868655).

The spelling of 21666333502043 in words is "twenty-one trillion, six hundred sixty-six billion, three hundred thirty-three million, five hundred two thousand, forty-three".