121201210121 has 4 divisors (see below), whose sum is σ = 127580221200. Its totient is φ = 114822199044.

The previous prime is 121201210027. The next prime is 121201210127. The reversal of 121201210121 is 121012102121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201210121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201210096 and 121201210105.

It is not an unprimeable number, because it can be changed into a prime (121201210127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3189505511 + ... + 3189505548.

It is an arithmetic number, because the mean of its divisors is an integer number (31895055300).

Almost surely, 2^121201210121 is an apocalyptic number.

It is an amenable number.

121201210121 is a deficient number, since it is larger than the sum of its proper divisors (6379011079).

121201210121 is an equidigital number, since it uses as much as digits as its factorization.

121201210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6379011078.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121201210121 its reverse (121012102121), we get a palindrome (242213312242).

The spelling of 121201210121 in words is "one hundred twenty-one billion, two hundred one million, two hundred ten thousand, one hundred twenty-one".