1231320020100 has 144 divisors (see below), whose sum is σ = 3698068475136. Its totient is φ = 316097280000.

The previous prime is 1231320020087. The next prime is 1231320020107. The reversal of 1231320020100 is 10200231321.

It is a super-2 number, since 2×1231320020100² (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 a self number, because there is not a number n which added to its sum of digits gives 1231320020100.

It is not an unprimeable number, because it can be changed into a prime (1231320020107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144300 + ... + 1575900.

Almost surely, 2^{1231320020100} is an apocalyptic number.

1231320020100 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 1231320020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849034237568).

1231320020100 is an abundant number, since it is smaller than the sum of its proper divisors (2466748455036).

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

1231320020100 is a wasteful number, since it uses less digits than its factorization.

1231320020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431726 (or 1431719 counting only the distinct ones).

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

Adding to 1231320020100 its reverse (10200231321), we get a palindrome (1241520251421).

The spelling of 1231320020100 in words is "one trillion, two hundred thirty-one billion, three hundred twenty million, twenty thousand, one hundred".