2212121165 has 8 divisors (see below), whose sum is σ = 2658336408. Its totient is φ = 1767169600.

The previous prime is 2212121147. The next prime is 2212121167. The reversal of 2212121165 is 5611212122.

It can be written as a sum of positive squares in 4 ways, for example, as 86081284 + 2126039881 = 9278^2 + 46109^2 .

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

It is not a de Polignac number, because 2212121165 - 2¹⁴ = 2212104781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212121165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212121167) 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, 312062 + ... + 319071.

It is an arithmetic number, because the mean of its divisors is an integer number (332292051).

Almost surely, 2^2212121165 is an apocalyptic number.

It is an amenable number.

2212121165 is a deficient number, since it is larger than the sum of its proper divisors (446215243).

2212121165 is an equidigital number, since it uses as much as digits as its factorization.

2212121165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631839.

The product of its digits is 480, while the sum is 23.

The square root of 2212121165 is about 47033.1921625569. The cubic root of 2212121165 is about 1302.9756619040.

Adding to 2212121165 its reverse (5611212122), we get a palindrome (7823333287).

The spelling of 2212121165 in words is "two billion, two hundred twelve million, one hundred twenty-one thousand, one hundred sixty-five".