22200221 has 4 divisors (see below), whose sum is σ = 23165472. Its totient is φ = 21234972.

The previous prime is 22200179. The next prime is 22200263. The reversal of 22200221 is 12200222.

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 an emirpimes, since its reverse is a distinct semiprime: 12200222 = 2 ⋅6100111.

It is an interprime number because it is at equal distance from previous prime (22200179) and next prime (22200263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22200221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22200281) 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, 482591 + ... + 482636.

It is an arithmetic number, because the mean of its divisors is an integer number (5791368).

Almost surely, 2^22200221 is an apocalyptic number.

It is an amenable number.

22200221 is a deficient number, since it is larger than the sum of its proper divisors (965251).

22200221 is an equidigital number, since it uses as much as digits as its factorization.

22200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965250.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22200221 is about 4711.7110480164. The cubic root of 22200221 is about 281.0514083829.

Adding to 22200221 its reverse (12200222), we get a palindrome (34400443).

Subtracting from 22200221 its reverse (12200222), we obtain a palindrome (9999999).

The spelling of 22200221 in words is "twenty-two million, two hundred thousand, two hundred twenty-one".