11515151214121 has 2 divisors, whose sum is σ = 11515151214122. Its totient is φ = 11515151214120.

The previous prime is 11515151214101. The next prime is 11515151214187. The reversal of 11515151214121 is 12141215151511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11217977955625 + 297173258496 = 3349325^2 + 545136^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515151214121 - 2²¹ = 11515149116969 is a prime.

It is not a weakly prime, because it can be changed into another prime (11515151214101) 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, 5757575607060 + 5757575607061.

It is an arithmetic number, because the mean of its divisors is an integer number (5757575607061).

Almost surely, 2^{11515151214121} is an apocalyptic number.

It is an amenable number.

11515151214121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515151214121 is an equidigital number, since it uses as much as digits as its factorization.

11515151214121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000, while the sum is 31.

Adding to 11515151214121 its reverse (12141215151511), we get a palindrome (23656366365632).

The spelling of 11515151214121 in words is "eleven trillion, five hundred fifteen billion, one hundred fifty-one million, two hundred fourteen thousand, one hundred twenty-one".