121000111110251 has 2 divisors, whose sum is σ = 121000111110252. Its totient is φ = 121000111110250.

The previous prime is 121000111110247. The next prime is 121000111110259. The reversal of 121000111110251 is 152011111000121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121000111110251 - 2² = 121000111110247 is a prime.

It is not a weakly prime, because it can be changed into another prime (121000111110259) 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, 60500055555125 + 60500055555126.

It is an arithmetic number, because the mean of its divisors is an integer number (60500055555126).

Almost surely, 2^{121000111110251} is an apocalyptic number.

121000111110251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000111110251 is an equidigital number, since it uses as much as digits as its factorization.

121000111110251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 17.

Adding to 121000111110251 its reverse (152011111000121), we get a palindrome (273011222110372).

The spelling of 121000111110251 in words is "one hundred twenty-one trillion, one hundred eleven million, one hundred ten thousand, two hundred fifty-one".