22422221 has 4 divisors (see below), whose sum is σ = 22943712. Its totient is φ = 21900732.

The previous prime is 22422199. The next prime is 22422227. The reversal of 22422221 is 12222422.

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 22422221 - 2⁶ = 22422157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22422221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22422227) 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, 260681 + ... + 260766.

It is an arithmetic number, because the mean of its divisors is an integer number (5735928).

Almost surely, 2^22422221 is an apocalyptic number.

It is an amenable number.

22422221 is a deficient number, since it is larger than the sum of its proper divisors (521491).

22422221 is an equidigital number, since it uses as much as digits as its factorization.

22422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521490.

The product of its digits is 256, while the sum is 17.

The square root of 22422221 is about 4735.2107661645. The cubic root of 22422221 is about 281.9851315870.

Adding to 22422221 its reverse (12222422), we get a palindrome (34644643).

The spelling of 22422221 in words is "twenty-two million, four hundred twenty-two thousand, two hundred twenty-one".