2171172012 has 12 divisors (see below), whose sum is σ = 5066068056. Its totient is φ = 723724000.

The previous prime is 2171172011. The next prime is 2171172019. The reversal of 2171172012 is 2102711712.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (2171172011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90465489 + ... + 90465512.

It is an arithmetic number, because the mean of its divisors is an integer number (422172338).

Almost surely, 2^2171172012 is an apocalyptic number.

It is an amenable number.

2171172012 is an abundant number, since it is smaller than the sum of its proper divisors (2894896044).

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

2171172012 is a wasteful number, since it uses less digits than its factorization.

2171172012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180931008 (or 180931006 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 2171172012 is about 46595.8368526631. The cubic root of 2171172012 is about 1294.8856280580.

Adding to 2171172012 its reverse (2102711712), we get a palindrome (4273883724).

The spelling of 2171172012 in words is "two billion, one hundred seventy-one million, one hundred seventy-two thousand, twelve".