11331220012121 has 2 divisors, whose sum is σ = 11331220012122. Its totient is φ = 11331220012120.

The previous prime is 11331220012117. The next prime is 11331220012127. The reversal of 11331220012121 is 12121002213311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6013584012121 + 5317636000000 = 2452261^2 + 2306000^2 .

It is a cyclic number.

It is not a de Polignac number, because 11331220012121 - 2² = 11331220012117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11331220012093 and 11331220012102.

It is not a weakly prime, because it can be changed into another prime (11331220012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5665610006060 + 5665610006061.

It is an arithmetic number, because the mean of its divisors is an integer number (5665610006061).

Almost surely, 2^{11331220012121} is an apocalyptic number.

It is an amenable number.

11331220012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11331220012121 is an equidigital number, since it uses as much as digits as its factorization.

11331220012121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 11331220012121 its reverse (12121002213311), we get a palindrome (23452222225432).

The spelling of 11331220012121 in words is "eleven trillion, three hundred thirty-one billion, two hundred twenty million, twelve thousand, one hundred twenty-one".