1221312300312 has 32 divisors (see below), whose sum is σ = 3288148501680. Its totient is φ = 375788400000.

The previous prime is 1221312300311. The next prime is 1221312300347. The reversal of 1221312300312 is 2130032131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221312300311) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1957230939 + ... + 1957231562.

Almost surely, 2^{1221312300312} is an apocalyptic number.

1221312300312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221312300312 is an abundant number, since it is smaller than the sum of its proper divisors (2066836201368).

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

1221312300312 is a wasteful number, since it uses less digits than its factorization.

1221312300312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914462523 (or 3914462519 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1221312300312 its reverse (2130032131221), we get a palindrome (3351344431533).

The spelling of 1221312300312 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred thousand, three hundred twelve".