2212106665 has 8 divisors (see below), whose sum is σ = 2655349128. Its totient is φ = 1769137920.

The previous prime is 2212106641. The next prime is 2212106669. The reversal of 2212106665 is 5666012122.

It can be written as a sum of positive squares in 4 ways, for example, as 617621904 + 1594484761 = 24852^2 + 39931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2212106665 - 2²³ = 2203718057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212106669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50206 + ... + 83335.

It is an arithmetic number, because the mean of its divisors is an integer number (331918641).

Almost surely, 2^2212106665 is an apocalyptic number.

It is an amenable number.

2212106665 is a deficient number, since it is larger than the sum of its proper divisors (443242463).

2212106665 is a wasteful number, since it uses less digits than its factorization.

2212106665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136859.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2212106665 is about 47033.0380158458. The cubic root of 2212106665 is about 1302.9728149851.

Adding to 2212106665 its reverse (5666012122), we get a palindrome (7878118787).

The spelling of 2212106665 in words is "two billion, two hundred twelve million, one hundred six thousand, six hundred sixty-five".