11211010212221 has 2 divisors, whose sum is σ = 11211010212222. Its totient is φ = 11211010212220.

The previous prime is 11211010212203. The next prime is 11211010212223. The reversal of 11211010212221 is 12221201011211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7762431220996 + 3448578991225 = 2786114^2 + 1857035^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211010212221 - 2¹⁰ = 11211010211197 is a prime.

It is a Sophie Germain prime.

Together with 11211010212223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211010212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211010212223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605505106110 + 5605505106111.

It is an arithmetic number, because the mean of its divisors is an integer number (5605505106111).

Almost surely, 2^{11211010212221} is an apocalyptic number.

It is an amenable number.

11211010212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211010212221 is an equidigital number, since it uses as much as digits as its factorization.

11211010212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11211010212221 its reverse (12221201011211), we get a palindrome (23432211223432).

The spelling of 11211010212221 in words is "eleven trillion, two hundred eleven billion, ten million, two hundred twelve thousand, two hundred twenty-one".