12213212131121 has 4 divisors (see below), whose sum is σ = 12213406588272. Its totient is φ = 12213017673972.

The previous prime is 12213212131027. The next prime is 12213212131123. The reversal of 12213212131121 is 12113121231221.

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 a de Polignac number, because none of the positive numbers 2^k-12213212131121 is a prime.

It is a super-3 number, since 3×12213212131121³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213212131123) 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, 97134335 + ... + 97259988.

It is an arithmetic number, because the mean of its divisors is an integer number (3053351647068).

Almost surely, 2^{12213212131121} is an apocalyptic number.

It is an amenable number.

12213212131121 is a deficient number, since it is larger than the sum of its proper divisors (194457151).

12213212131121 is an equidigital number, since it uses as much as digits as its factorization.

12213212131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194457150.

The product of its digits is 288, while the sum is 23.

Adding to 12213212131121 its reverse (12113121231221), we get a palindrome (24326333362342).

The spelling of 12213212131121 in words is "twelve trillion, two hundred thirteen billion, two hundred twelve million, one hundred thirty-one thousand, one hundred twenty-one".