22212102221 has 4 divisors (see below), whose sum is σ = 22374234492. Its totient is φ = 22049969952.

The previous prime is 22212102173. The next prime is 22212102277. The reversal of 22212102221 is 12220121222.

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: 12220121222 = 2 ⋅6110060611.

It can be written as a sum of positive squares in 2 ways, for example, as 6956394025 + 15255708196 = 83405^2 + 123514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22212102221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22212102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212108221) 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, 81065930 + ... + 81066203.

It is an arithmetic number, because the mean of its divisors is an integer number (5593558623).

Almost surely, 2^22212102221 is an apocalyptic number.

It is an amenable number.

22212102221 is a deficient number, since it is larger than the sum of its proper divisors (162132271).

22212102221 is a wasteful number, since it uses less digits than its factorization.

22212102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162132270.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22212102221 its reverse (12220121222), we get a palindrome (34432223443).

The spelling of 22212102221 in words is "twenty-two billion, two hundred twelve million, one hundred two thousand, two hundred twenty-one".