2181132 has 36 divisors (see below), whose sum is σ = 5645640. Its totient is φ = 709632.

The previous prime is 2181131. The next prime is 2181139. The reversal of 2181132 is 2311812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2181131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 844 + ... + 2252.

2^2181132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2822820).

2181132 is an abundant number, since it is smaller than the sum of its proper divisors (3464508).

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

2181132 is a wasteful number, since it uses less digits than its factorization.

2181132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1457 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 2181132 is about 1476.8655998431. The cubic root of 2181132 is about 129.6862651549.

Adding to 2181132 its reverse (2311812), we get a palindrome (4492944).

The spelling of 2181132 in words is "two million, one hundred eighty-one thousand, one hundred thirty-two".