121201122121 has 4 divisors (see below), whose sum is σ = 124019752912. Its totient is φ = 118382491332.

The previous prime is 121201122041. The next prime is 121201122167. The reversal of 121201122121 is 121221102121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121201122121 - 2¹⁵ = 121201089353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201122095 and 121201122104.

It is not an unprimeable number, because it can be changed into a prime (121201122521) 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 in 3 ways as a sum of consecutive naturals, for example, 1409315331 + ... + 1409315416.

It is an arithmetic number, because the mean of its divisors is an integer number (31004938228).

Almost surely, 2^121201122121 is an apocalyptic number.

It is an amenable number.

121201122121 is a deficient number, since it is larger than the sum of its proper divisors (2818630791).

121201122121 is an equidigital number, since it uses as much as digits as its factorization.

121201122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818630790.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121201122121 its reverse (121221102121), we get a palindrome (242422224242).

The spelling of 121201122121 in words is "one hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, one hundred twenty-one".