1202121100121 has 2 divisors, whose sum is σ = 1202121100122. Its totient is φ = 1202121100120.

The previous prime is 1202121100109. The next prime is 1202121100303. The reversal of 1202121100121 is 1210011212021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966163180096 + 235957920025 = 982936^2 + 485755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202121100121 - 2³⁴ = 1184941230937 is a prime.

It is a super-2 number, since 2×1202121100121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1202121100096 and 1202121100105.

It is not a weakly prime, because it can be changed into another prime (1202121120121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601060550060 + 601060550061.

It is an arithmetic number, because the mean of its divisors is an integer number (601060550061).

Almost surely, 2^{1202121100121} is an apocalyptic number.

It is an amenable number.

1202121100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202121100121 is an equidigital number, since it uses as much as digits as its factorization.

1202121100121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1202121100121 its reverse (1210011212021), we get a palindrome (2412132312142).

The spelling of 1202121100121 in words is "one trillion, two hundred two billion, one hundred twenty-one million, one hundred thousand, one hundred twenty-one".