22221211021 has 4 divisors (see below), whose sum is σ = 22228334044. Its totient is φ = 22214088000.

The previous prime is 22221210997. The next prime is 22221211063. The reversal of 22221211021 is 12011212222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011212222 = 2 ⋅6005606111.

It can be written as a sum of positive squares in 2 ways, for example, as 4066612900 + 18154598121 = 63770^2 + 134739^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221211021 - 2¹¹ = 22221208973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22221210986 and 22221211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221218021) 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, 3556830 + ... + 3563071.

It is an arithmetic number, because the mean of its divisors is an integer number (5557083511).

Almost surely, 2^22221211021 is an apocalyptic number.

It is an amenable number.

22221211021 is a deficient number, since it is larger than the sum of its proper divisors (7123023).

22221211021 is an equidigital number, since it uses as much as digits as its factorization.

22221211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7123022.

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

Adding to 22221211021 its reverse (12011212222), we get a palindrome (34232423243).

The spelling of 22221211021 in words is "twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".