2721181812 has 12 divisors (see below), whose sum is σ = 6349424256. Its totient is φ = 907060600.

The previous prime is 2721181811. The next prime is 2721181847. The reversal of 2721181812 is 2181811272.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721181811) 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, 113382564 + ... + 113382587.

It is an arithmetic number, because the mean of its divisors is an integer number (529118688).

Almost surely, 2^2721181812 is an apocalyptic number.

It is an amenable number.

2721181812 is an abundant number, since it is smaller than the sum of its proper divisors (3628242444).

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

2721181812 is a wasteful number, since it uses less digits than its factorization.

2721181812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226765158 (or 226765156 counting only the distinct ones).

The product of its digits is 3584, while the sum is 33.

The square root of 2721181812 is about 52164.9481165274. The cubic root of 2721181812 is about 1396.1085490971.

The spelling of 2721181812 in words is "two billion, seven hundred twenty-one million, one hundred eighty-one thousand, eight hundred twelve".