1231123231100 has 216 divisors, whose sum is σ = 3189895833600. Its totient is φ = 411027281280.

The previous prime is 1231123231049. The next prime is 1231123231213. The reversal of 1231123231100 is 11323211321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 45816269 + ... + 45843131.

Almost surely, 2^{1231123231100} is an apocalyptic number.

1231123231100 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 1231123231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594947916800).

1231123231100 is an abundant number, since it is smaller than the sum of its proper divisors (1958772602500).

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

1231123231100 is a wasteful number, since it uses less digits than its factorization.

1231123231100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27137 (or 27123 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1231123231100 its reverse (11323211321), we get a palindrome (1242446442421).

The spelling of 1231123231100 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred".