1311244323420 has 24 divisors (see below), whose sum is σ = 3671484105744. Its totient is φ = 349665152896.

The previous prime is 1311244323407. The next prime is 1311244323421. The reversal of 1311244323420 is 243234421131.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311244323421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10927035969 + ... + 10927036088.

It is an arithmetic number, because the mean of its divisors is an integer number (152978504406).

Almost surely, 2^{1311244323420} is an apocalyptic number.

1311244323420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311244323420 is an abundant number, since it is smaller than the sum of its proper divisors (2360239782324).

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

1311244323420 is a wasteful number, since it uses less digits than its factorization.

1311244323420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21854072069 (or 21854072067 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1311244323420 its reverse (243234421131), we get a palindrome (1554478744551).

It can be divided in two parts, 131124 and 4323420, that added together give a palindrome (4454544).

The spelling of 1311244323420 in words is "one trillion, three hundred eleven billion, two hundred forty-four million, three hundred twenty-three thousand, four hundred twenty".