1131103231220 has 48 divisors (see below), whose sum is σ = 2378614206528. Its totient is φ = 451813486080.

The previous prime is 1131103231187. The next prime is 1131103231267. The reversal of 1131103231220 is 221323011311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1131103231192 and 1131103231201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120287039 + ... + 120296441.

It is an arithmetic number, because the mean of its divisors is an integer number (49554462636).

Almost surely, 2^{1131103231220} is an apocalyptic number.

1131103231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131103231220 is an abundant number, since it is smaller than the sum of its proper divisors (1247510975308).

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

1131103231220 is a wasteful number, since it uses less digits than its factorization.

1131103231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120 (or 17118 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1131103231220 its reverse (221323011311), we get a palindrome (1352426242531).

The spelling of 1131103231220 in words is "one trillion, one hundred thirty-one billion, one hundred three million, two hundred thirty-one thousand, two hundred twenty".