1312221213212 has 48 divisors (see below), whose sum is σ = 2841120264192. Its totient is φ = 516402544320.

The previous prime is 1312221213181. The next prime is 1312221213269. The reversal of 1312221213212 is 2123121222131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9367658 + ... + 9506705.

It is an arithmetic number, because the mean of its divisors is an integer number (59190005504).

Almost surely, 2^{1312221213212} is an apocalyptic number.

It is an amenable number.

1312221213212 is an abundant number, since it is smaller than the sum of its proper divisors (1528899050980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312221213212 is a wasteful number, since it uses less digits than its factorization.

1312221213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18874578 (or 18874576 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 1312221213212 its reverse (2123121222131), we get a palindrome (3435342435343).

The spelling of 1312221213212 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, two hundred thirteen thousand, two hundred twelve".