2171801860 has 24 divisors (see below), whose sum is σ = 4666850496. Its totient is φ = 848517600.

The previous prime is 2171801837. The next prime is 2171801893. The reversal of 2171801860 is 681081712.

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, 1261816 + ... + 1263535.

It is an arithmetic number, because the mean of its divisors is an integer number (194452104).

Almost surely, 2^2171801860 is an apocalyptic number.

2171801860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171801860 is an abundant number, since it is smaller than the sum of its proper divisors (2495048636).

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

2171801860 is a wasteful number, since it uses less digits than its factorization.

2171801860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525403 (or 2525401 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 2171801860 is about 46602.5949921246. The cubic root of 2171801860 is about 1295.0108296029.

The spelling of 2171801860 in words is "two billion, one hundred seventy-one million, eight hundred one thousand, eight hundred sixty".