121112221102121 has 2 divisors, whose sum is σ = 121112221102122. Its totient is φ = 121112221102120.

The previous prime is 121112221102111. The next prime is 121112221102123. The reversal of 121112221102121 is 121201122211121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83939238890896 + 37172982211225 = 9161836^2 + 6096965^2 .

It is an emirp because it is prime and its reverse (121201122211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121112221102121 - 2³⁴ = 121095041232937 is a prime.

Together with 121112221102123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121112221102093 and 121112221102102.

It is not a weakly prime, because it can be changed into another prime (121112221102123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556110551060 + 60556110551061.

It is an arithmetic number, because the mean of its divisors is an integer number (60556110551061).

Almost surely, 2^{121112221102121} is an apocalyptic number.

It is an amenable number.

121112221102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112221102121 is an equidigital number, since it uses as much as digits as its factorization.

121112221102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121112221102121 its reverse (121201122211121), we get a palindrome (242313343313242).

The spelling of 121112221102121 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".