1231031220000 has 120 divisors (see below), whose sum is σ = 4038028804656. Its totient is φ = 328274976000.

The previous prime is 1231031219993. The next prime is 1231031220007. The reversal of 1231031220000 is 221301321.

It is an interprime number because it is at equal distance from previous prime (1231031219993) and next prime (1231031220007).

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1231031220000² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1231031220007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10198594 + ... + 10318593.

Almost surely, 2^{1231031220000} is an apocalyptic number.

1231031220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231031220000 is an abundant number, since it is smaller than the sum of its proper divisors (2806997584656).

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

1231031220000 is an equidigital number, since it uses as much as digits as its factorization.

1231031220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20517220 (or 20517197 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 1231031220000 its reverse (221301321), we get a palindrome (1231252521321).

The spelling of 1231031220000 in words is "one trillion, two hundred thirty-one billion, thirty-one million, two hundred twenty thousand".