22442221 has 4 divisors (see below), whose sum is σ = 22453600. Its totient is φ = 22430844.

The previous prime is 22442219. The next prime is 22442237. The reversal of 22442221 is 12224422.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22442221 - 2¹ = 22442219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22442281) 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, 1881 + ... + 6958.

It is an arithmetic number, because the mean of its divisors is an integer number (5613400).

Almost surely, 2^22442221 is an apocalyptic number.

It is an amenable number.

22442221 is a deficient number, since it is larger than the sum of its proper divisors (11379).

22442221 is an equidigital number, since it uses as much as digits as its factorization.

22442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378.

The product of its digits is 512, while the sum is 19.

The square root of 22442221 is about 4737.3221338642. The cubic root of 22442221 is about 282.0689476467.

Adding to 22442221 its reverse (12224422), we get a palindrome (34666643).

It can be divided in two parts, 2244 and 2221, that added together give a triangular number (4465 = T₉₄).

The spelling of 22442221 in words is "twenty-two million, four hundred forty-two thousand, two hundred twenty-one".