1031311233220 has 144 divisors (see below), whose sum is σ = 2335590690048. Its totient is φ = 382376816640.

The previous prime is 1031311233149. The next prime is 1031311233221. The reversal of 1031311233220 is 223321131301.

It is a junction number, because it is equal to n+sod(n) for n = 1031311233191 and 1031311233200.

It is not an unprimeable number, because it can be changed into a prime (1031311233221) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 384385999 + ... + 384388681.

It is an arithmetic number, because the mean of its divisors is an integer number (16219379792).

Almost surely, 2^{1031311233220} is an apocalyptic number.

1031311233220 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 1031311233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1167795345024).

1031311233220 is an abundant number, since it is smaller than the sum of its proper divisors (1304279456828).

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

1031311233220 is a wasteful number, since it uses less digits than its factorization.

1031311233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710 (or 3691 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1031311233220 its reverse (223321131301), we get a palindrome (1254632364521).

The spelling of 1031311233220 in words is "one trillion, thirty-one billion, three hundred eleven million, two hundred thirty-three thousand, two hundred twenty".