121221021211121 has 4 divisors (see below), whose sum is σ = 130545715150452. Its totient is φ = 111896327271792.

The previous prime is 121221021211111. The next prime is 121221021211151. The reversal of 121221021211121 is 121112120122121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13194910950400 + 108026110260721 = 3632480^2 + 10393561^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221021211121 - 2²⁶ = 121220954102257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121221021211093 and 121221021211102.

It is not an unprimeable number, because it can be changed into a prime (121221021211111) 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 3 ways as a sum of consecutive naturals, for example, 4662346969646 + ... + 4662346969671.

It is an arithmetic number, because the mean of its divisors is an integer number (32636428787613).

Almost surely, 2^{121221021211121} is an apocalyptic number.

It is an amenable number.

121221021211121 is a deficient number, since it is larger than the sum of its proper divisors (9324693939331).

121221021211121 is an equidigital number, since it uses as much as digits as its factorization.

121221021211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324693939330.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121221021211121 its reverse (121112120122121), we get a palindrome (242333141333242).

The spelling of 121221021211121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred eleven thousand, one hundred twenty-one".