121220111111121 has 96 divisors (see below), whose sum is σ = 208032327869184. Its totient is φ = 67265003520000.

The previous prime is 121220111111101. The next prime is 121220111111149. The reversal of 121220111111121 is 121111111022121.

It is not a de Polignac number, because 121220111111121 - 2¹⁰ = 121220111110097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220111111094 and 121220111111103.

It is not an unprimeable number, because it can be changed into a prime (121220111111101) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7301680 + ... + 17197521.

It is an arithmetic number, because the mean of its divisors is an integer number (2167003415304).

Almost surely, 2^{121220111111121} is an apocalyptic number.

121220111111121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220111111121 is a deficient number, since it is larger than the sum of its proper divisors (86812216758063).

121220111111121 is a wasteful number, since it uses less digits than its factorization.

121220111111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24499335 (or 24499332 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 121220111111121 its reverse (121111111022121), we get a palindrome (242331222133242).

The spelling of 121220111111121 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".