22181841 has 18 divisors (see below), whose sum is σ = 35219730. Its totient is φ = 13442880.

The previous prime is 22181813. The next prime is 22181879. The reversal of 22181841 is 14818122.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 1742400 = 4521^2 + 1320^2 .

It is not a de Polignac number, because 22181841 - 2⁶ = 22181777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22181801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9096 + ... + 11273.

Almost surely, 2^22181841 is an apocalyptic number.

It is an amenable number.

22181841 is a deficient number, since it is larger than the sum of its proper divisors (13037889).

22181841 is a wasteful number, since it uses less digits than its factorization.

22181841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20397 (or 20383 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 22181841 is about 4709.7601849776. The cubic root of 22181841 is about 280.9738243032.

Adding to 22181841 its reverse (14818122), we get a palindrome (36999963).

The spelling of 22181841 in words is "twenty-two million, one hundred eighty-one thousand, eight hundred forty-one".