1212311002321 has 4 divisors (see below), whose sum is σ = 1213420162612. Its totient is φ = 1211201842032.

The previous prime is 1212311002303. The next prime is 1212311002349. The reversal of 1212311002321 is 1232001132121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 951766092225 + 260544910096 = 975585^2 + 510436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212311002321 - 2²⁹ = 1211774131409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212311012321) 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, 554578506 + ... + 554580691.

It is an arithmetic number, because the mean of its divisors is an integer number (303355040653).

Almost surely, 2^{1212311002321} is an apocalyptic number.

It is an amenable number.

1212311002321 is a deficient number, since it is larger than the sum of its proper divisors (1109160291).

1212311002321 is a wasteful number, since it uses less digits than its factorization.

1212311002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109160290.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1212311002321 its reverse (1232001132121), we get a palindrome (2444312134442).

The spelling of 1212311002321 in words is "one trillion, two hundred twelve billion, three hundred eleven million, two thousand, three hundred twenty-one".