1221310210312 has 16 divisors (see below), whose sum is σ = 2290152225600. Its totient is φ = 610602950160.

The previous prime is 1221310210291. The next prime is 1221310210319. The reversal of 1221310210312 is 2130120131221.

It is a super-2 number, since 2×1221310210312² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221310210312.

It is not an unprimeable number, because it can be changed into a prime (1221310210319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6419764 + ... + 6607267.

It is an arithmetic number, because the mean of its divisors is an integer number (143134514100).

Almost surely, 2^{1221310210312} is an apocalyptic number.

It is an amenable number.

1221310210312 is a deficient number, since it is larger than the sum of its proper divisors (1068842015288).

1221310210312 is a wasteful number, since it uses less digits than its factorization.

1221310210312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13038756 (or 13038752 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221310210312 its reverse (2130120131221), we get a palindrome (3351430341533).

The spelling of 1221310210312 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, two hundred ten thousand, three hundred twelve".