121220121202121 has 16 divisors (see below), whose sum is σ = 132881891427840. Its totient is φ = 110152094088960.

The previous prime is 121220121202097. The next prime is 121220121202207. The reversal of 121220121202121 is 121202121022121.

It is a cyclic number.

It is not a de Polignac number, because 121220121202121 - 2¹⁰ = 121220121201097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220121202093 and 121220121202102.

It is not an unprimeable number, because it can be changed into a prime (121220121204121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910582370 + ... + 910715483.

It is an arithmetic number, because the mean of its divisors is an integer number (8305118214240).

Almost surely, 2^{121220121202121} is an apocalyptic number.

It is an amenable number.

121220121202121 is a deficient number, since it is larger than the sum of its proper divisors (11661770225719).

121220121202121 is a wasteful number, since it uses less digits than its factorization.

121220121202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821298016.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121220121202121 its reverse (121202121022121), we get a palindrome (242422242224242).

The spelling of 121220121202121 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".