1311111233220 has 96 divisors (see below), whose sum is σ = 3997580630400. Its totient is φ = 319806434304.

The previous prime is 1311111233203. The next prime is 1311111233227. The reversal of 1311111233220 is 223321111131.

It is not an unprimeable number, because it can be changed into a prime (1311111233227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19796209 + ... + 19862328.

It is an arithmetic number, because the mean of its divisors is an integer number (41641464900).

Almost surely, 2^{1311111233220} is an apocalyptic number.

1311111233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311111233220 is an abundant number, since it is smaller than the sum of its proper divisors (2686469397180).

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

1311111233220 is a wasteful number, since it uses less digits than its factorization.

1311111233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39658597 (or 39658595 counting only the distinct ones).

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

Adding to 1311111233220 its reverse (223321111131), we get a palindrome (1534432344351).

The spelling of 1311111233220 in words is "one trillion, three hundred eleven billion, one hundred eleven million, two hundred thirty-three thousand, two hundred twenty".