22202120221 has 4 divisors (see below), whose sum is σ = 22206757212. Its totient is φ = 22197483232.

The previous prime is 22202120191. The next prime is 22202120231. The reversal of 22202120221 is 12202120222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11201047225 + 11001072996 = 105835^2 + 104886^2 .

It is a cyclic number.

It is not a de Polignac number, because 22202120221 - 2⁷ = 22202120093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22202120195 and 22202120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22202120231) 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, 2311306 + ... + 2320891.

It is an arithmetic number, because the mean of its divisors is an integer number (5551689303).

Almost surely, 2^22202120221 is an apocalyptic number.

It is an amenable number.

22202120221 is a deficient number, since it is larger than the sum of its proper divisors (4636991).

22202120221 is an equidigital number, since it uses as much as digits as its factorization.

22202120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636990.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22202120221 its reverse (12202120222), we get a palindrome (34404240443).

Subtracting from 22202120221 its reverse (12202120222), we obtain a palindrome (9999999999).

It can be divided in two parts, 222021 and 20221, that added together give a palindrome (242242).

The spelling of 22202120221 in words is "twenty-two billion, two hundred two million, one hundred twenty thousand, two hundred twenty-one".