1231112020020 has 96 divisors (see below), whose sum is σ = 3490169679360. Its totient is φ = 324199424640.

The previous prime is 1231112020013. The next prime is 1231112020027. The reversal of 1231112020020 is 200202111321.

It is an interprime number because it is at equal distance from previous prime (1231112020013) and next prime (1231112020027).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231112020027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11595375 + ... + 11701065.

It is an arithmetic number, because the mean of its divisors is an integer number (36355934160).

Almost surely, 2^{1231112020020} is an apocalyptic number.

1231112020020 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 1231112020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745084839680).

1231112020020 is an abundant number, since it is smaller than the sum of its proper divisors (2259057659340).

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

1231112020020 is a wasteful number, since it uses less digits than its factorization.

1231112020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108125 (or 108123 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1231112020020 its reverse (200202111321), we get a palindrome (1431314131341).

The spelling of 1231112020020 in words is "one trillion, two hundred thirty-one billion, one hundred twelve million, twenty thousand, twenty".