2171131986 has 16 divisors (see below), whose sum is σ = 4347000000. Its totient is φ = 722921328.

The previous prime is 2171131969. The next prime is 2171132017. The reversal of 2171131986 is 6891311712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191361 + ... + 202388.

It is an arithmetic number, because the mean of its divisors is an integer number (271687500).

Almost surely, 2^2171131986 is an apocalyptic number.

2171131986 is an abundant number, since it is smaller than the sum of its proper divisors (2175868014).

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

2171131986 is a wasteful number, since it uses less digits than its factorization.

2171131986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394673.

The product of its digits is 18144, while the sum is 39.

The square root of 2171131986 is about 46595.4073487935. The cubic root of 2171131986 is about 1294.8776708487.

The spelling of 2171131986 in words is "two billion, one hundred seventy-one million, one hundred thirty-one thousand, nine hundred eighty-six".