1211310313212 has 96 divisors (see below), whose sum is σ = 3070333728000. Its totient is φ = 370200886272.

The previous prime is 1211310313189. The next prime is 1211310313217. The reversal of 1211310313212 is 2123130131121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211310313217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3142414 + ... + 3506762.

It is an arithmetic number, because the mean of its divisors is an integer number (31982643000).

Almost surely, 2^{1211310313212} is an apocalyptic number.

1211310313212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211310313212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1535166864000).

1211310313212 is an abundant number, since it is smaller than the sum of its proper divisors (1859023414788).

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

1211310313212 is a wasteful number, since it uses less digits than its factorization.

1211310313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364795 (or 364793 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1211310313212 its reverse (2123130131121), we get a palindrome (3334440444333).

The spelling of 1211310313212 in words is "one trillion, two hundred eleven billion, three hundred ten million, three hundred thirteen thousand, two hundred twelve".