1311240123240 has 64 divisors (see below), whose sum is σ = 3948236040960. Its totient is φ = 348373751040.

The previous prime is 1311240123233. The next prime is 1311240123247. The reversal of 1311240123240 is 423210421131.

It is an interprime number because it is at equal distance from previous prime (1311240123233) and next prime (1311240123247).

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 1311240123240.

It is not an unprimeable number, because it can be changed into a prime (1311240123247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20127999 + ... + 20193038.

It is an arithmetic number, because the mean of its divisors is an integer number (61691188140).

Almost surely, 2^{1311240123240} is an apocalyptic number.

1311240123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311240123240 is an abundant number, since it is smaller than the sum of its proper divisors (2636995917720).

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

1311240123240 is a wasteful number, since it uses less digits than its factorization.

1311240123240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40321322 (or 40321318 counting only the distinct ones).

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

Adding to 1311240123240 its reverse (423210421131), we get a palindrome (1734450544371).

The spelling of 1311240123240 in words is "one trillion, three hundred eleven billion, two hundred forty million, one hundred twenty-three thousand, two hundred forty".