2161171712 has 72 divisors (see below), whose sum is σ = 4966723776. Its totient is φ = 919351296.

The previous prime is 2161171709. The next prime is 2161171717. The reversal of 2161171712 is 2171711612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161171717) 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, 241103 + ... + 249905.

Almost surely, 2^2161171712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161171712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483361888).

2161171712 is an abundant number, since it is smaller than the sum of its proper divisors (2805552064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161171712 is an equidigital number, since it uses as much as digits as its factorization.

2161171712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8963 (or 8949 counting only the distinct ones).

The product of its digits is 1176, while the sum is 29.

The square root of 2161171712 is about 46488.4040595071. The cubic root of 2161171712 is about 1292.8945103765.

The spelling of 2161171712 in words is "two billion, one hundred sixty-one million, one hundred seventy-one thousand, seven hundred twelve".