2165717121 has 8 divisors (see below), whose sum is σ = 2892382464. Its totient is φ = 1441431600.

The previous prime is 2165717119. The next prime is 2165717137. The reversal of 2165717121 is 1217175612.

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

It is not a de Polignac number, because 2165717121 - 2¹ = 2165717119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165717101) 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, 592830 + ... + 596471.

It is an arithmetic number, because the mean of its divisors is an integer number (361547808).

Almost surely, 2^2165717121 is an apocalyptic number.

It is an amenable number.

2165717121 is a deficient number, since it is larger than the sum of its proper divisors (726665343).

2165717121 is a wasteful number, since it uses less digits than its factorization.

2165717121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189911.

The product of its digits is 5880, while the sum is 33.

The square root of 2165717121 is about 46537.2659381705. The cubic root of 2165717121 is about 1293.8002874150.

The spelling of 2165717121 in words is "two billion, one hundred sixty-five million, seven hundred seventeen thousand, one hundred twenty-one".