1211323012312 has 64 divisors (see below), whose sum is σ = 2639952311040. Its totient is φ = 510360489600.

The previous prime is 1211323012261. The next prime is 1211323012313. The reversal of 1211323012312 is 2132103231121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211323012313) 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 15 ways as a sum of consecutive naturals, for example, 13362 + ... + 1556542.

It is an arithmetic number, because the mean of its divisors is an integer number (41249254860).

Almost surely, 2^{1211323012312} 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 1211323012312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319976155520).

1211323012312 is an abundant number, since it is smaller than the sum of its proper divisors (1428629298728).

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

1211323012312 is a wasteful number, since it uses less digits than its factorization.

1211323012312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543432 (or 1543428 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1211323012312 its reverse (2132103231121), we get a palindrome (3343426243433).

The spelling of 1211323012312 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, twelve thousand, three hundred twelve".