1031320221020 has 12 divisors (see below), whose sum is σ = 2165772464184. Its totient is φ = 412528088400.

The previous prime is 1031320221011. The next prime is 1031320221023. The reversal of 1031320221020 is 201220231301.

It is a self number, because there is not a number n which added to its sum of digits gives 1031320221020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031320221023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25783005506 + ... + 25783005545.

It is an arithmetic number, because the mean of its divisors is an integer number (180481038682).

Almost surely, 2^{1031320221020} is an apocalyptic number.

1031320221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031320221020 is an abundant number, since it is smaller than the sum of its proper divisors (1134452243164).

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

1031320221020 is a wasteful number, since it uses less digits than its factorization.

1031320221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51566011060 (or 51566011058 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1031320221020 its reverse (201220231301), we get a palindrome (1232540452321).

The spelling of 1031320221020 in words is "one trillion, thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, twenty".