2181036 has 96 divisors (see below), whose sum is σ = 6322176. Its totient is φ = 576000.

The previous prime is 2181031. The next prime is 2181071. The reversal of 2181036 is 6301812.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53176 + ... + 53216.

It is an arithmetic number, because the mean of its divisors is an integer number (65856).

2^2181036 is an apocalyptic number.

2181036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3161088).

2181036 is an abundant number, since it is smaller than the sum of its proper divisors (4141140).

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

2181036 is a wasteful number, since it uses less digits than its factorization.

2181036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2181036 is about 1476.8330982206. The cubic root of 2181036 is about 129.6843624634.

Adding to 2181036 its reverse (6301812), we get a palindrome (8482848).

The spelling of 2181036 in words is "two million, one hundred eighty-one thousand, thirty-six".