2171201772 has 12 divisors (see below), whose sum is σ = 5066137496. Its totient is φ = 723733920.

The previous prime is 2171201761. The next prime is 2171201803. The reversal of 2171201772 is 2771021712.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90466729 + ... + 90466752.

Almost surely, 2^2171201772 is an apocalyptic number.

It is an amenable number.

2171201772 is an abundant number, since it is smaller than the sum of its proper divisors (2894935724).

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

2171201772 is a wasteful number, since it uses less digits than its factorization.

2171201772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180933488 (or 180933486 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 30.

The square root of 2171201772 is about 46596.1561934029. The cubic root of 2171201772 is about 1294.8915443128.

The spelling of 2171201772 in words is "two billion, one hundred seventy-one million, two hundred one thousand, seven hundred seventy-two".