1311212234040 has 128 divisors (see below), whose sum is σ = 4067957790720. Its totient is φ = 337758220800.

The previous prime is 1311212234039. The next prime is 1311212234083. The reversal of 1311212234040 is 404322121131.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1311212234040.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1712650 + ... + 2357030.

It is an arithmetic number, because the mean of its divisors is an integer number (31780920240).

Almost surely, 2^{1311212234040} is an apocalyptic number.

1311212234040 is a gapful number since it is divisible by the number (10) 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 1311212234040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2033978895360).

1311212234040 is an abundant number, since it is smaller than the sum of its proper divisors (2756745556680).

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

1311212234040 is a wasteful number, since it uses less digits than its factorization.

1311212234040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644973 (or 644969 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1311212234040 its reverse (404322121131), we get a palindrome (1715534355171).

The spelling of 1311212234040 in words is "one trillion, three hundred eleven billion, two hundred twelve million, two hundred thirty-four thousand, forty".