1231231210020 has 576 divisors, whose sum is σ = 4513457894400. Its totient is φ = 265605120000.

The previous prime is 1231231210003. The next prime is 1231231210021. The reversal of 1231231210020 is 200121321321.

1231231210020 is a `hidden beast` number, since 1 + 231 + 2 + 312 + 100 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1231231209975 and 1231231210002.

It is not an unprimeable number, because it can be changed into a prime (1231231210021) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1173718456 + ... + 1173719504.

It is an arithmetic number, because the mean of its divisors is an integer number (7835864400).

Almost surely, 2^{1231231210020} is an apocalyptic number.

1231231210020 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 1231231210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2256728947200).

1231231210020 is an abundant number, since it is smaller than the sum of its proper divisors (3282226684380).

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

1231231210020 is a wasteful number, since it uses less digits than its factorization.

1231231210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596 (or 1591 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1231231210020 its reverse (200121321321), we get a palindrome (1431352531341).

The spelling of 1231231210020 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred ten thousand, twenty".