121220111220221 has 16 divisors (see below), whose sum is σ = 131864076658944. Its totient is φ = 110766199287744.

The previous prime is 121220111220217. The next prime is 121220111220227. The reversal of 121220111220221 is 122022111022121.

It is not a de Polignac number, because 121220111220221 - 2² = 121220111220217 is a prime.

It is a super-3 number, since 3×121220111220221³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220111220193 and 121220111220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111220227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30989870 + ... + 34681583.

It is an arithmetic number, because the mean of its divisors is an integer number (8241504791184).

Almost surely, 2^{121220111220221} is an apocalyptic number.

It is an amenable number.

121220111220221 is a deficient number, since it is larger than the sum of its proper divisors (10643965438723).

121220111220221 is a wasteful number, since it uses less digits than its factorization.

121220111220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65672900.

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

Adding to 121220111220221 its reverse (122022111022121), we get a palindrome (243242222242342).

The spelling of 121220111220221 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".