2181320 has 32 divisors (see below), whose sum is σ = 5123520. Its totient is φ = 834240.

The previous prime is 2181271. The next prime is 2181329. The reversal of 2181320 is 231812.

It is not an unprimeable number, because it can be changed into a prime (2181329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (160110).

2^2181320 is an apocalyptic number.

2181320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181320 is an abundant number, since it is smaller than the sum of its proper divisors (2942200).

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

2181320 is a wasteful number, since it uses less digits than its factorization.

2181320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405 (or 2401 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2181320 is about 1476.9292467820. The cubic root of 2181320 is about 129.6899910975.

The spelling of 2181320 in words is "two million, one hundred eighty-one thousand, three hundred twenty".