121221220121 has 8 divisors (see below), whose sum is σ = 122095227744. Its totient is φ = 120348802080.

The previous prime is 121221220111. The next prime is 121221220147. The reversal of 121221220121 is 121022122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121221220121 - 2²⁶ = 121154111257 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 121221220121.

It is not an unprimeable number, because it can be changed into a prime (121221220111) 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 7 ways as a sum of consecutive naturals, for example, 244115 + ... + 549576.

It is an arithmetic number, because the mean of its divisors is an integer number (15261903468).

Almost surely, 2^121221220121 is an apocalyptic number.

It is an amenable number.

121221220121 is a deficient number, since it is larger than the sum of its proper divisors (874007623).

121221220121 is an equidigital number, since it uses as much as digits as its factorization.

121221220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794791.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221220121 its reverse (121022122121), we get a palindrome (242243342242).

The spelling of 121221220121 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".