2166701221105 has 4 divisors (see below), whose sum is σ = 2600041465332. Its totient is φ = 1733360976880.

The previous prime is 2166701221093. The next prime is 2166701221133. The reversal of 2166701221105 is 5011221076612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 241026011136 + 1925675209969 = 490944^2 + 1387687^2 .

It is not a de Polignac number, because 2166701221105 - 2¹⁷ = 2166701090033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216670122106 + ... + 216670122115.

It is an arithmetic number, because the mean of its divisors is an integer number (650010366333).

Almost surely, 2^{2166701221105} is an apocalyptic number.

It is an amenable number.

2166701221105 is a deficient number, since it is larger than the sum of its proper divisors (433340244227).

2166701221105 is an equidigital number, since it uses as much as digits as its factorization.

2166701221105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433340244226.

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 2166701221105 its reverse (5011221076612), we get a palindrome (7177922297717).

The spelling of 2166701221105 in words is "two trillion, one hundred sixty-six billion, seven hundred one million, two hundred twenty-one thousand, one hundred five".