2181836380 has 12 divisors (see below), whose sum is σ = 4581856440. Its totient is φ = 872734544.

The previous prime is 2181836369. The next prime is 2181836407. The reversal of 2181836380 is 836381812.

It is a congruent number.

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, 54545890 + ... + 54545929.

It is an arithmetic number, because the mean of its divisors is an integer number (381821370).

Almost surely, 2^2181836380 is an apocalyptic number.

2181836380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181836380 is an abundant number, since it is smaller than the sum of its proper divisors (2400020060).

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

2181836380 is a wasteful number, since it uses less digits than its factorization.

2181836380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109091828 (or 109091826 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 2181836380 is about 46710.1314491835. The cubic root of 2181836380 is about 1297.0022405025.

The spelling of 2181836380 in words is "two billion, one hundred eighty-one million, eight hundred thirty-six thousand, three hundred eighty".