1031223231220 has 96 divisors (see below), whose sum is σ = 2670414098688. Its totient is φ = 325740828672.

The previous prime is 1031223231191. The next prime is 1031223231251. The reversal of 1031223231220 is 221323221301.

It is a junction number, because it is equal to n+sod(n) for n = 1031223231191 and 1031223231200.

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 31 ways as a sum of consecutive naturals, for example, 410172 + ... + 1493548.

It is an arithmetic number, because the mean of its divisors is an integer number (27816813528).

Almost surely, 2^{1031223231220} is an apocalyptic number.

1031223231220 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 1031223231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335207049344).

1031223231220 is an abundant number, since it is smaller than the sum of its proper divisors (1639190867468).

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

1031223231220 is a wasteful number, since it uses less digits than its factorization.

1031223231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083929 (or 1083927 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1031223231220 its reverse (221323221301), we get a palindrome (1252546452521).

The spelling of 1031223231220 in words is "one trillion, thirty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty".