22221110212221 has 4 divisors (see below), whose sum is σ = 29628146949632. Its totient is φ = 14814073474812.

The previous prime is 22221110212121. The next prime is 22221110212253. The reversal of 22221110212221 is 12221201112222.

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 not a de Polignac number, because 22221110212221 - 2²² = 22221106017917 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 (22221110212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703518368701 + ... + 3703518368706.

It is an arithmetic number, because the mean of its divisors is an integer number (7407036737408).

Almost surely, 2^{22221110212221} is an apocalyptic number.

It is an amenable number.

22221110212221 is a deficient number, since it is larger than the sum of its proper divisors (7407036737411).

22221110212221 is an equidigital number, since it uses as much as digits as its factorization.

22221110212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407036737410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22221110212221 its reverse (12221201112222), we get a palindrome (34442311324443).

Subtracting from 22221110212221 its reverse (12221201112222), we obtain a palindrome (9999909099999).

The spelling of 22221110212221 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, two hundred twenty-one".