1323131000020 has 12 divisors (see below), whose sum is σ = 2778575100084. Its totient is φ = 529252400000.

The previous prime is 1323131000011. The next prime is 1323131000021. The reversal of 1323131000020 is 200001313231.

It can be written as a sum of positive squares in 2 ways, for example, as 888562628496 + 434568371524 = 942636^2 + 659218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1323130999958 and 1323131000003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323131000021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33078274981 + ... + 33078275020.

It is an arithmetic number, because the mean of its divisors is an integer number (231547925007).

Almost surely, 2^{1323131000020} is an apocalyptic number.

1323131000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323131000020 is an abundant number, since it is smaller than the sum of its proper divisors (1455444100064).

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

1323131000020 is a wasteful number, since it uses less digits than its factorization.

1323131000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66156550010 (or 66156550008 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 1323131000020 its reverse (200001313231), we get a palindrome (1523132313251).

The spelling of 1323131000020 in words is "one trillion, three hundred twenty-three billion, one hundred thirty-one million, twenty", and thus it is an aban number.