131220320100 has 36 divisors (see below), whose sum is σ = 379664127024. Its totient is φ = 34992085280.

The previous prime is 131220320057. The next prime is 131220320111. The reversal of 131220320100 is 1023022131.

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 131220320100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218700234 + ... + 218700833.

Almost surely, 2^131220320100 is an apocalyptic number.

131220320100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131220320100 is an abundant number, since it is smaller than the sum of its proper divisors (248443806924).

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

131220320100 is a wasteful number, since it uses less digits than its factorization.

131220320100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437401084 (or 437401077 counting only the distinct ones).

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

Adding to 131220320100 its reverse (1023022131), we get a palindrome (132243342231).

The spelling of 131220320100 in words is "one hundred thirty-one billion, two hundred twenty million, three hundred twenty thousand, one hundred".