1231423502020 has 144 divisors (see below), whose sum is σ = 2749321673280. Its totient is φ = 463114183168.

The previous prime is 1231423502009. The next prime is 1231423502039. The reversal of 1231423502020 is 202053241321.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 106178862 + ... + 106190458.

It is an arithmetic number, because the mean of its divisors is an integer number (19092511620).

Almost surely, 2^{1231423502020} is an apocalyptic number.

1231423502020 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 1231423502020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374660836640).

1231423502020 is an abundant number, since it is smaller than the sum of its proper divisors (1517898171260).

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

1231423502020 is a wasteful number, since it uses less digits than its factorization.

1231423502020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11830 (or 11799 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 1231423502020 its reverse (202053241321), we get a palindrome (1433476743341).

The spelling of 1231423502020 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, five hundred two thousand, twenty".