121210221110121 has 160 divisors (see below), whose sum is σ = 215938001664000. Its totient is φ = 66785193256320.

The previous prime is 121210221110081. The next prime is 121210221110137. The reversal of 121210221110121 is 121011122012121.

It is a happy number.

121210221110121 is a `hidden beast` number, since 1 + 2 + 1 + 210 + 221 + 110 + 121 = 666.

121210221110121 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 121210221110121 - 2¹⁸ = 121210220847977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210221110094 and 121210221110103.

It is not an unprimeable number, because it can be changed into a prime (121210221110141) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5354033520 + ... + 5354056158.

It is an arithmetic number, because the mean of its divisors is an integer number (1349612510400).

Almost surely, 2^{121210221110121} is an apocalyptic number.

121210221110121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121210221110121 is a deficient number, since it is larger than the sum of its proper divisors (94727780553879).

121210221110121 is a wasteful number, since it uses less digits than its factorization.

121210221110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29641 (or 29632 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121210221110121 its reverse (121011122012121), we get a palindrome (242221343122242).

The spelling of 121210221110121 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".