12021311311213 has 12 divisors (see below), whose sum is σ = 12895300681788. Its totient is φ = 11201912159040.

The previous prime is 12021311311171. The next prime is 12021311311241. The reversal of 12021311311213 is 31211311312021.

It can be written as a sum of positive squares in 2 ways, for example, as 3445708612644 + 8575602698569 = 1856262^2 + 2928413^2 .

It is not a de Polignac number, because 12021311311213 - 2³⁷ = 11883872357741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021311315213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272929056 + ... + 272973097.

It is an arithmetic number, because the mean of its divisors is an integer number (1074608390149).

Almost surely, 2^{12021311311213} is an apocalyptic number.

It is an amenable number.

12021311311213 is a deficient number, since it is larger than the sum of its proper divisors (873989370575).

12021311311213 is an equidigital number, since it uses as much as digits as its factorization.

12021311311213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545902252 (or 545902233 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 12021311311213 its reverse (31211311312021), we get a palindrome (43232622623234).

The spelling of 12021311311213 in words is "twelve trillion, twenty-one billion, three hundred eleven million, three hundred eleven thousand, two hundred thirteen".