11111100202121 has 2 divisors, whose sum is σ = 11111100202122. Its totient is φ = 11111100202120.

The previous prime is 11111100202093. The next prime is 11111100202127. The reversal of 11111100202121 is 12120200111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10320798760000 + 790301442121 = 3212600^2 + 888989^2 .

It is an emirp because it is prime and its reverse (12120200111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111100202121 - 2¹⁴ = 11111100185737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111100202096 and 11111100202105.

It is not a weakly prime, because it can be changed into another prime (11111100202127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555550101060 + 5555550101061.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550101061).

Almost surely, 2^{11111100202121} is an apocalyptic number.

It is an amenable number.

11111100202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111100202121 is an equidigital number, since it uses as much as digits as its factorization.

11111100202121 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 14.

Adding to 11111100202121 its reverse (12120200111111), we get a palindrome (23231300313232).

The spelling of 11111100202121 in words is "eleven trillion, one hundred eleven billion, one hundred million, two hundred two thousand, one hundred twenty-one".