2181056 has 28 divisors (see below), whose sum is σ = 4416552. Its totient is φ = 1068288.

The previous prime is 2181031. The next prime is 2181071. The reversal of 2181056 is 6501812.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

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

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, 3071 + ... + 3713.

It is an arithmetic number, because the mean of its divisors is an integer number (157734).

2^2181056 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 2181056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2208276).

2181056 is an abundant number, since it is smaller than the sum of its proper divisors (2235496).

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

2181056 is an equidigital number, since it uses as much as digits as its factorization.

2181056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2181056 is about 1476.8398694510. The cubic root of 2181056 is about 129.6847588621.

Adding to 2181056 its reverse (6501812), we get a palindrome (8682868).

The spelling of 2181056 in words is "two million, one hundred eighty-one thousand, fifty-six".