1311103211220 has 144 divisors (see below), whose sum is σ = 4393478718720. Its totient is φ = 313819833600.

The previous prime is 1311103211177. The next prime is 1311103211233. The reversal of 1311103211220 is 221123011131.

1311103211220 is a `hidden beast` number, since 1 + 311 + 1 + 0 + 321 + 12 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1311103211193 and 1311103211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4034551 + ... + 4347390.

It is an arithmetic number, because the mean of its divisors is an integer number (30510268880).

Almost surely, 2^{1311103211220} is an apocalyptic number.

1311103211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311103211220 is an abundant number, since it is smaller than the sum of its proper divisors (3082375507500).

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

1311103211220 is a wasteful number, since it uses less digits than its factorization.

1311103211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382046 (or 8382041 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1311103211220 its reverse (221123011131), we get a palindrome (1532226222351).

The spelling of 1311103211220 in words is "one trillion, three hundred eleven billion, one hundred three million, two hundred eleven thousand, two hundred twenty".