1201000122121 has 2 divisors, whose sum is σ = 1201000122122. Its totient is φ = 1201000122120.

The previous prime is 1201000122103. The next prime is 1201000122151. The reversal of 1201000122121 is 1212210001021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694147254025 + 506852868096 = 833155^2 + 711936^2 .

It is an emirp because it is prime and its reverse (1212210001021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201000122121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201000122151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600500061060 + 600500061061.

It is an arithmetic number, because the mean of its divisors is an integer number (600500061061).

Almost surely, 2^{1201000122121} is an apocalyptic number.

It is an amenable number.

1201000122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201000122121 is an equidigital number, since it uses as much as digits as its factorization.

1201000122121 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 13.

Adding to 1201000122121 its reverse (1212210001021), we get a palindrome (2413210123142).

The spelling of 1201000122121 in words is "one trillion, two hundred one billion, one hundred twenty-two thousand, one hundred twenty-one".