11203111121221 has 2 divisors, whose sum is σ = 11203111121222. Its totient is φ = 11203111121220.

The previous prime is 11203111121203. The next prime is 11203111121297. The reversal of 11203111121221 is 12212111130211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10899829617121 + 303281504100 = 3301489^2 + 550710^2 .

It is a cyclic number.

It is not a de Polignac number, because 11203111121221 - 2⁹ = 11203111120709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11203111122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5601555560610 + 5601555560611.

It is an arithmetic number, because the mean of its divisors is an integer number (5601555560611).

Almost surely, 2^{11203111121221} is an apocalyptic number.

It is an amenable number.

11203111121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11203111121221 is an equidigital number, since it uses as much as digits as its factorization.

11203111121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11203111121221 its reverse (12212111130211), we get a palindrome (23415222251432).

The spelling of 11203111121221 in words is "eleven trillion, two hundred three billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".