121001111112121 has 2 divisors, whose sum is σ = 121001111112122. Its totient is φ = 121001111112120.

The previous prime is 121001111112031. The next prime is 121001111112179. The reversal of 121001111112121 is 121211111100121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120061568622121 + 939542490000 = 10957261^2 + 969300^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001111112121 - 2³⁵ = 120966751373753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121001111112095 and 121001111112104.

It is not a weakly prime, because it can be changed into another prime (121001111112821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500555556060 + 60500555556061.

It is an arithmetic number, because the mean of its divisors is an integer number (60500555556061).

Almost surely, 2^{121001111112121} is an apocalyptic number.

It is an amenable number.

121001111112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001111112121 is an equidigital number, since it uses as much as digits as its factorization.

121001111112121 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 16.

Adding to 121001111112121 its reverse (121211111100121), we get a palindrome (242212222212242).

The spelling of 121001111112121 in words is "one hundred twenty-one trillion, one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".