11111142311221 has 2 divisors, whose sum is σ = 11111142311222. Its totient is φ = 11111142311220.

The previous prime is 11111142311209. The next prime is 11111142311317. The reversal of 11111142311221 is 12211324111111.

It is a m-pointer prime, because the next prime (11111142311317) can be obtained adding 11111142311221 to its product of digits (96).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10497762000625 + 613380310596 = 3240025^2 + 783186^2 .

It is an emirp because it is prime and its reverse (12211324111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111142311221 - 2⁵ = 11111142311189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111142311192 and 11111142311201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111142311921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555571155610 + 5555571155611.

It is an arithmetic number, because the mean of its divisors is an integer number (5555571155611).

Almost surely, 2^{11111142311221} is an apocalyptic number.

It is an amenable number.

11111142311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111142311221 is an equidigital number, since it uses as much as digits as its factorization.

11111142311221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 22.

Adding to 11111142311221 its reverse (12211324111111), we get a palindrome (23322466422332).

The spelling of 11111142311221 in words is "eleven trillion, one hundred eleven billion, one hundred forty-two million, three hundred eleven thousand, two hundred twenty-one".