22000221 has 8 divisors (see below), whose sum is σ = 32592960. Its totient is φ = 14666796.

The previous prime is 22000211. The next prime is 22000243. The reversal of 22000221 is 12200022.

It is not a de Polignac number, because 22000221 - 2¹¹ = 21998173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407385 + ... + 407438.

It is an arithmetic number, because the mean of its divisors is an integer number (4074120).

Almost surely, 2^22000221 is an apocalyptic number.

It is an amenable number.

22000221 is a deficient number, since it is larger than the sum of its proper divisors (10592739).

22000221 is an equidigital number, since it uses as much as digits as its factorization.

22000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814832 (or 814826 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22000221 is about 4690.4393184434. The cubic root of 22000221 is about 280.2048713210.

Adding to 22000221 its reverse (12200022), we get a palindrome (34200243).

The spelling of 22000221 in words is "twenty-two million, two hundred twenty-one", and thus it is an aban number.