1311020404120 has 128 divisors (see below), whose sum is σ = 3435574746240. Its totient is φ = 440912609280.

The previous prime is 1311020404063. The next prime is 1311020404121. The reversal of 1311020404120 is 214040201131.

It is a super-2 number, since 2×1311020404120² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311020404121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99911160 + ... + 99924280.

It is an arithmetic number, because the mean of its divisors is an integer number (26840427705).

Almost surely, 2^{1311020404120} is an apocalyptic number.

1311020404120 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 1311020404120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717787373120).

1311020404120 is an abundant number, since it is smaller than the sum of its proper divisors (2124554342120).

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

1311020404120 is a wasteful number, since it uses less digits than its factorization.

1311020404120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19925 (or 19921 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1311020404120 its reverse (214040201131), we get a palindrome (1525060605251).

The spelling of 1311020404120 in words is "one trillion, three hundred eleven billion, twenty million, four hundred four thousand, one hundred twenty".