11111101000121 has 2 divisors, whose sum is σ = 11111101000122. Its totient is φ = 11111101000120.

The previous prime is 11111101000099. The next prime is 11111101000133. The reversal of 11111101000121 is 12100010111111.

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., 7806776871721 + 3304324128400 = 2794061^2 + 1817780^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111101000121 - 2³⁴ = 11093921130937 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111101002121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555550500060 + 5555550500061.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550500061).

Almost surely, 2^{11111101000121} is an apocalyptic number.

It is an amenable number.

11111101000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111101000121 is an equidigital number, since it uses as much as digits as its factorization.

11111101000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111101000121 its reverse (12100010111111), we get a palindrome (23211111111232).

The spelling of 11111101000121 in words is "eleven trillion, one hundred eleven billion, one hundred one million, one hundred twenty-one", and thus it is an aban number.