121201321121 has 4 divisors (see below), whose sum is σ = 121474913712. Its totient is φ = 120927728532.

The previous prime is 121201321099. The next prime is 121201321217. The reversal of 121201321121 is 121123102121.

It is a happy number.

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 not a de Polignac number, because 121201321121 - 2⁶ = 121201321057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121201321121.

It is not an unprimeable number, because it can be changed into a prime (121201321321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136795631 + ... + 136796516.

It is an arithmetic number, because the mean of its divisors is an integer number (30368728428).

Almost surely, 2^121201321121 is an apocalyptic number.

It is an amenable number.

121201321121 is a deficient number, since it is larger than the sum of its proper divisors (273592591).

121201321121 is an equidigital number, since it uses as much as digits as its factorization.

121201321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273592590.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121201321121 its reverse (121123102121), we get a palindrome (242324423242).

The spelling of 121201321121 in words is "one hundred twenty-one billion, two hundred one million, three hundred twenty-one thousand, one hundred twenty-one".