1311111323220 has 96 divisors (see below), whose sum is σ = 3831295668480. Its totient is φ = 334378598400.

The previous prime is 1311111323219. The next prime is 1311111323231. The reversal of 1311111323220 is 223231111131.

It is a super-2 number, since 2×1311111323220² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9688020 + ... + 9822420.

It is an arithmetic number, because the mean of its divisors is an integer number (39909329880).

Almost surely, 2^{1311111323220} is an apocalyptic number.

1311111323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311111323220 is an abundant number, since it is smaller than the sum of its proper divisors (2520184345260).

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

1311111323220 is a wasteful number, since it uses less digits than its factorization.

1311111323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141505 (or 141503 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1311111323220 its reverse (223231111131), we get a palindrome (1534342434351).

The spelling of 1311111323220 in words is "one trillion, three hundred eleven billion, one hundred eleven million, three hundred twenty-three thousand, two hundred twenty".