1231001123320 has 32 divisors (see below), whose sum is σ = 2788095273120. Its totient is φ = 489139516800.

The previous prime is 1231001123249. The next prime is 1231001123323. The reversal of 1231001123320 is 233211001321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001123323) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 101898027 + ... + 101910106.

It is an arithmetic number, because the mean of its divisors is an integer number (87127977285).

Almost surely, 2^{1231001123320} is an apocalyptic number.

1231001123320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231001123320 is an abundant number, since it is smaller than the sum of its proper divisors (1557094149800).

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

1231001123320 is a wasteful number, since it uses less digits than its factorization.

1231001123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203808295 (or 203808291 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1231001123320 its reverse (233211001321), we get a palindrome (1464212124641).

The spelling of 1231001123320 in words is "one trillion, two hundred thirty-one billion, one million, one hundred twenty-three thousand, three hundred twenty".