11111221201 has 2 divisors, whose sum is σ = 11111221202. Its totient is φ = 11111221200.

The previous prime is 11111221193. The next prime is 11111221213. The reversal of 11111221201 is 10212211111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9148731201 + 1962490000 = 95649^2 + 44300^2 .

It is an emirp because it is prime and its reverse (10212211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111221201 - 2³ = 11111221193 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111221001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555610600 + 5555610601.

It is an arithmetic number, because the mean of its divisors is an integer number (5555610601).

Almost surely, 2^11111221201 is an apocalyptic number.

It is an amenable number.

11111221201 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111221201 is an equidigital number, since it uses as much as digits as its factorization.

11111221201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111221201 its reverse (10212211111), we get a palindrome (21323432312).

The spelling of 11111221201 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, two hundred one".