22042181 has 4 divisors (see below), whose sum is σ = 25191072. Its totient is φ = 18893292.

The previous prime is 22042177. The next prime is 22042193. The reversal of 22042181 is 18124022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22042181 - 2² = 22042177 is a prime.

It is a super-2 number, since 2×22042181² = 971715486473522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22042171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574435 + ... + 1574448.

It is an arithmetic number, because the mean of its divisors is an integer number (6297768).

Almost surely, 2^22042181 is an apocalyptic number.

It is an amenable number.

22042181 is a deficient number, since it is larger than the sum of its proper divisors (3148891).

22042181 is an equidigital number, since it uses as much as digits as its factorization.

22042181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148890.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 22042181 is about 4694.9101162855. The cubic root of 22042181 is about 280.3828987680.

The spelling of 22042181 in words is "twenty-two million, forty-two thousand, one hundred eighty-one".