2122171665 has 16 divisors (see below), whose sum is σ = 3412715328. Its totient is φ = 1126078016.

The previous prime is 2122171663. The next prime is 2122171673. The reversal of 2122171665 is 5661712212.

It is a cyclic number.

It is not a de Polignac number, because 2122171665 - 2¹ = 2122171663 is a prime.

It is a super-2 number, since 2×2122171665² = 9007225151457744450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2122171661) 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, 356127 + ... + 362036.

It is an arithmetic number, because the mean of its divisors is an integer number (213294708).

Almost surely, 2^2122171665 is an apocalyptic number.

It is an amenable number.

2122171665 is a deficient number, since it is larger than the sum of its proper divisors (1290543663).

2122171665 is a wasteful number, since it uses less digits than its factorization.

2122171665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718368.

The product of its digits is 10080, while the sum is 33.

The square root of 2122171665 is about 46067.0344715177. The cubic root of 2122171665 is about 1285.0701541839.

Adding to 2122171665 its reverse (5661712212), we get a palindrome (7783883877).

The spelling of 2122171665 in words is "two billion, one hundred twenty-two million, one hundred seventy-one thousand, six hundred sixty-five".