21668883389417 has 16 divisors (see below), whose sum is σ = 23780770376832. Its totient is φ = 19580665509120.

The previous prime is 21668883389393. The next prime is 21668883389429. The reversal of 21668883389417 is 71498338886612.

It is a cyclic number.

It is not a de Polignac number, because 21668883389417 - 2⁶ = 21668883389353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21668883389467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186458033 + ... + 186574209.

It is an arithmetic number, because the mean of its divisors is an integer number (1486298148552).

Almost surely, 2^{21668883389417} is an apocalyptic number.

It is an amenable number.

21668883389417 is a deficient number, since it is larger than the sum of its proper divisors (2111886987415).

21668883389417 is a wasteful number, since it uses less digits than its factorization.

21668883389417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217888.

The product of its digits is 668860416, while the sum is 74.

The spelling of 21668883389417 in words is "twenty-one trillion, six hundred sixty-eight billion, eight hundred eighty-three million, three hundred eighty-nine thousand, four hundred seventeen".