1221312767312 has 80 divisors (see below), whose sum is σ = 2619079225344. Its totient is φ = 547049328000.

The previous prime is 1221312767293. The next prime is 1221312767377. The reversal of 1221312767312 is 2137672131221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26055737 + ... + 26102567.

Almost surely, 2^{1221312767312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221312767312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309539612672).

1221312767312 is an abundant number, since it is smaller than the sum of its proper divisors (1397766458032).

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

1221312767312 is a wasteful number, since it uses less digits than its factorization.

1221312767312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49008 (or 49002 counting only the distinct ones).

The product of its digits is 42336, while the sum is 38.

Adding to 1221312767312 its reverse (2137672131221), we get a palindrome (3358984898533).

The spelling of 1221312767312 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, seven hundred sixty-seven thousand, three hundred twelve".