11211022112221 has 2 divisors, whose sum is σ = 11211022112222. Its totient is φ = 11211022112220.

The previous prime is 11211022112131. The next prime is 11211022112231. The reversal of 11211022112221 is 12221122011211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10845890756100 + 365131356121 = 3293310^2 + 604261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211022112221 - 2⁷ = 11211022112093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211022112231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605511056110 + 5605511056111.

It is an arithmetic number, because the mean of its divisors is an integer number (5605511056111).

Almost surely, 2^{11211022112221} is an apocalyptic number.

It is an amenable number.

11211022112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211022112221 is an equidigital number, since it uses as much as digits as its factorization.

11211022112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11211022112221 its reverse (12221122011211), we get a palindrome (23432144123432).

It can be divided in two parts, 1121102 and 2112221, that added together give a palindrome (3233323).

The spelling of 11211022112221 in words is "eleven trillion, two hundred eleven billion, twenty-two million, one hundred twelve thousand, two hundred twenty-one".