1213123223312 has 320 divisors, whose sum is σ = 3239409997824. Its totient is φ = 424796037120.

The previous prime is 1213123223303. The next prime is 1213123223321. The reversal of 1213123223312 is 2133223213121.

It is an interprime number because it is at equal distance from previous prime (1213123223303) and next prime (1213123223321).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232085243 + ... + 232090469.

Almost surely, 2^{1213123223312} 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 1213123223312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1619704998912).

1213123223312 is an abundant number, since it is smaller than the sum of its proper divisors (2026286774512).

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

1213123223312 is a wasteful number, since it uses less digits than its factorization.

1213123223312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646 (or 5640 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

Adding to 1213123223312 its reverse (2133223213121), we get a palindrome (3346346436433).

The spelling of 1213123223312 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, two hundred twenty-three thousand, three hundred twelve".