22211021221 has 4 divisors (see below), whose sum is σ = 22281087852. Its totient is φ = 22140954592.

The previous prime is 22211021191. The next prime is 22211021243. The reversal of 22211021221 is 12212011222.

It is a happy number.

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 3982241025 + 18228780196 = 63105^2 + 135014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211021221 - 2¹⁵ = 22210988453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211021195 and 22211021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211021321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35032840 + ... + 35033473.

It is an arithmetic number, because the mean of its divisors is an integer number (5570271963).

Almost surely, 2^22211021221 is an apocalyptic number.

It is an amenable number.

22211021221 is a deficient number, since it is larger than the sum of its proper divisors (70066631).

22211021221 is an equidigital number, since it uses as much as digits as its factorization.

22211021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70066630.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22211021221 its reverse (12212011222), we get a palindrome (34423032443).

Subtracting from 22211021221 its reverse (12212011222), we obtain a palindrome (9999009999).

The spelling of 22211021221 in words is "twenty-two billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".