22042221 has 4 divisors (see below), whose sum is σ = 29389632. Its totient is φ = 14694812.

The previous prime is 22042219. The next prime is 22042231. The reversal of 22042221 is 12224022.

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 22042221 - 2¹ = 22042219 is a prime.

It is a super-2 number, since 2×22042221² = 971719013225682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22042231) 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, 3673701 + ... + 3673706.

It is an arithmetic number, because the mean of its divisors is an integer number (7347408).

Almost surely, 2^22042221 is an apocalyptic number.

It is an amenable number.

22042221 is a deficient number, since it is larger than the sum of its proper divisors (7347411).

22042221 is an equidigital number, since it uses as much as digits as its factorization.

22042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22042221 is about 4694.9143762160. The cubic root of 22042221 is about 280.3830683717.

Adding to 22042221 its reverse (12224022), we get a palindrome (34266243).

The spelling of 22042221 in words is "twenty-two million, forty-two thousand, two hundred twenty-one".