2171277121 has 4 divisors (see below), whose sum is σ = 2338298452. Its totient is φ = 2004255792.

The previous prime is 2171277089. The next prime is 2171277133. The reversal of 2171277121 is 1217721712.

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 879952896 + 1291324225 = 29664^2 + 35935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171277121 - 2⁵ = 2171277089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171277151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83510646 + ... + 83510671.

It is an arithmetic number, because the mean of its divisors is an integer number (584574613).

Almost surely, 2^2171277121 is an apocalyptic number.

It is an amenable number.

2171277121 is a deficient number, since it is larger than the sum of its proper divisors (167021331).

2171277121 is a wasteful number, since it uses less digits than its factorization.

2171277121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167021330.

The product of its digits is 2744, while the sum is 31.

The square root of 2171277121 is about 46596.9647187454. The cubic root of 2171277121 is about 1294.9065233681.

Adding to 2171277121 its reverse (1217721712), we get a palindrome (3388998833).

The spelling of 2171277121 in words is "two billion, one hundred seventy-one million, two hundred seventy-seven thousand, one hundred twenty-one".