12213131221012 has 12 divisors (see below), whose sum is σ = 21373037663796. Its totient is φ = 6106549031360.

The previous prime is 12213131220991. The next prime is 12213131221069. The reversal of 12213131221012 is 21012213131221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3505934187396 + 8707197033616 = 1872414^2 + 2950796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2406289 + ... + 5496952.

It is an arithmetic number, because the mean of its divisors is an integer number (1781086471983).

Almost surely, 2^{12213131221012} is an apocalyptic number.

It is an amenable number.

12213131221012 is a deficient number, since it is larger than the sum of its proper divisors (9159906442784).

12213131221012 is a wasteful number, since it uses less digits than its factorization.

12213131221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8289578 (or 8289576 counting only the distinct ones).

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

Adding to 12213131221012 its reverse (21012213131221), we get a palindrome (33225344352233).

The spelling of 12213131221012 in words is "twelve trillion, two hundred thirteen billion, one hundred thirty-one million, two hundred twenty-one thousand, twelve".