11212202022221 has 2 divisors, whose sum is σ = 11212202022222. Its totient is φ = 11212202022220.

The previous prime is 11212202022167. The next prime is 11212202022223. The reversal of 11212202022221 is 12222020221211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10369366022500 + 842835999721 = 3220150^2 + 918061^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212202022221 - 2¹⁸ = 11212201760077 is a prime.

Together with 11212202022223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212202022193 and 11212202022202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212202022223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606101011110 + 5606101011111.

It is an arithmetic number, because the mean of its divisors is an integer number (5606101011111).

Almost surely, 2^{11212202022221} is an apocalyptic number.

It is an amenable number.

11212202022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212202022221 is an equidigital number, since it uses as much as digits as its factorization.

11212202022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 11212202022221 its reverse (12222020221211), we get a palindrome (23434222243432).

The spelling of 11212202022221 in words is "eleven trillion, two hundred twelve billion, two hundred two million, twenty-two thousand, two hundred twenty-one".