11111221220237 has 2 divisors, whose sum is σ = 11111221220238. Its totient is φ = 11111221220236.

The previous prime is 11111221220171. The next prime is 11111221220249. The reversal of 11111221220237 is 73202212211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11109515612836 + 1705607401 = 3333094^2 + 41299^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111221220237 - 2²⁴ = 11111204443021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111224220237) 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, 5555610610118 + 5555610610119.

It is an arithmetic number, because the mean of its divisors is an integer number (5555610610119).

Almost surely, 2^{11111221220237} is an apocalyptic number.

It is an amenable number.

11111221220237 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111221220237 is an equidigital number, since it uses as much as digits as its factorization.

11111221220237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 11111221220237 its reverse (73202212211111), we get a palindrome (84313433431348).

The spelling of 11111221220237 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred thirty-seven".