22201110212221 has 4 divisors (see below), whose sum is σ = 22742600705244. Its totient is φ = 21659619719200.

The previous prime is 22201110212191. The next prime is 22201110212273. The reversal of 22201110212221 is 12221201110222.

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 13189172256100 + 9011937956121 = 3631690^2 + 3001989^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201110212221 - 2³⁷ = 22063671258749 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 (22201110216221) 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, 270745246450 + ... + 270745246531.

It is an arithmetic number, because the mean of its divisors is an integer number (5685650176311).

Almost surely, 2^{22201110212221} is an apocalyptic number.

It is an amenable number.

22201110212221 is a deficient number, since it is larger than the sum of its proper divisors (541490493023).

22201110212221 is an equidigital number, since it uses as much as digits as its factorization.

22201110212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541490493022.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22201110212221 its reverse (12221201110222), we get a palindrome (34422311322443).

The spelling of 22201110212221 in words is "twenty-two trillion, two hundred one billion, one hundred ten million, two hundred twelve thousand, two hundred twenty-one".