21166304354219 has 2 divisors, whose sum is σ = 21166304354220. Its totient is φ = 21166304354218.

The previous prime is 21166304354201. The next prime is 21166304354243. The reversal of 21166304354219 is 91245340366112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21166304354219 - 2¹⁶ = 21166304288683 is a prime.

It is a super-2 number, since 2×21166304354219² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21166304354249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583152177109 + 10583152177110.

It is an arithmetic number, because the mean of its divisors is an integer number (10583152177110).

Almost surely, 2^{21166304354219} is an apocalyptic number.

21166304354219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21166304354219 is an equidigital number, since it uses as much as digits as its factorization.

21166304354219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 21166304354219 in words is "twenty-one trillion, one hundred sixty-six billion, three hundred four million, three hundred fifty-four thousand, two hundred nineteen".