12210312121321 has 4 divisors (see below), whose sum is σ = 12226970119492. Its totient is φ = 12193654123152.

The previous prime is 12210312121291. The next prime is 12210312121409. The reversal of 12210312121321 is 12312121301221.

It is a happy number.

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 11339813791296 + 870498330025 = 3367464^2 + 933005^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210312121321 - 2⁵ = 12210312121289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210312121292 and 12210312121301.

It is not an unprimeable number, because it can be changed into a prime (12210312125321) 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, 8328997986 + ... + 8328999451.

It is an arithmetic number, because the mean of its divisors is an integer number (3056742529873).

Almost surely, 2^{12210312121321} is an apocalyptic number.

It is an amenable number.

12210312121321 is a deficient number, since it is larger than the sum of its proper divisors (16657998171).

12210312121321 is an equidigital number, since it uses as much as digits as its factorization.

12210312121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16657998170.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 12210312121321 its reverse (12312121301221), we get a palindrome (24522433422542).

The spelling of 12210312121321 in words is "twelve trillion, two hundred ten billion, three hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".