44222221 has 4 divisors (see below), whose sum is σ = 44268192. Its totient is φ = 44176252.

The previous prime is 44222209. The next prime is 44222239. The reversal of 44222221 is 12222244.

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 a de Polignac number, because none of the positive numbers 2^k-44222221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44222921) 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, 21511 + ... + 23476.

It is an arithmetic number, because the mean of its divisors is an integer number (11067048).

Almost surely, 2^44222221 is an apocalyptic number.

It is an amenable number.

44222221 is a deficient number, since it is larger than the sum of its proper divisors (45971).

44222221 is an equidigital number, since it uses as much as digits as its factorization.

44222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45970.

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

The square root of 44222221 is about 6649.9790225233. The cubic root of 44222221 is about 353.6281672458.

Adding to 44222221 its reverse (12222244), we get a palindrome (56444465).

The spelling of 44222221 in words is "forty-four million, two hundred twenty-two thousand, two hundred twenty-one".