1221313120121 has 8 divisors (see below), whose sum is σ = 1252474610688. Its totient is φ = 1190217028000.

The previous prime is 1221313120061. The next prime is 1221313120147. The reversal of 1221313120121 is 1210213131221.

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 1221313120121 - 2¹⁰ = 1221313119097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221313120093 and 1221313120102.

It is not an unprimeable number, because it can be changed into a prime (1221313125121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16311785 + ... + 16386486.

It is an arithmetic number, because the mean of its divisors is an integer number (156559326336).

Almost surely, 2^{1221313120121} is an apocalyptic number.

It is an amenable number.

1221313120121 is a deficient number, since it is larger than the sum of its proper divisors (31161490567).

1221313120121 is an equidigital number, since it uses as much as digits as its factorization.

1221313120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32699223.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1221313120121 its reverse (1210213131221), we get a palindrome (2431526251342).

The spelling of 1221313120121 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, one hundred twenty thousand, one hundred twenty-one".