1231121600020 has 24 divisors (see below), whose sum is σ = 2784228849864. Its totient is φ = 454567975296.

The previous prime is 1231121600017. The next prime is 1231121600039. The reversal of 1231121600020 is 200061211321.

It can be written as a sum of positive squares in 4 ways, for example, as 29059339024 + 1202062260996 = 170468^2 + 1096386^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2367541279 + ... + 2367541798.

It is an arithmetic number, because the mean of its divisors is an integer number (116009535411).

Almost surely, 2^{1231121600020} is an apocalyptic number.

1231121600020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231121600020 is an abundant number, since it is smaller than the sum of its proper divisors (1553107249844).

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

1231121600020 is a wasteful number, since it uses less digits than its factorization.

1231121600020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4735083099 (or 4735083097 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1231121600020 its reverse (200061211321), we get a palindrome (1431182811341).

The spelling of 1231121600020 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, six hundred thousand, twenty".