131221003 has 8 divisors (see below), whose sum is σ = 137151648. Its totient is φ = 125309184.

The previous prime is 131220989. The next prime is 131221007. The reversal of 131221003 is 300122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131221003 - 2²⁵ = 97666571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10651 + ... + 19387.

It is an arithmetic number, because the mean of its divisors is an integer number (17143956).

Almost surely, 2^131221003 is an apocalyptic number.

131221003 is a deficient number, since it is larger than the sum of its proper divisors (5930645).

131221003 is an equidigital number, since it uses as much as digits as its factorization.

131221003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9413.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 131221003 is about 11455.1736346509. The cubic root of 131221003 is about 508.1607503238.

Adding to 131221003 its reverse (300122131), we get a palindrome (431343134).

The spelling of 131221003 in words is "one hundred thirty-one million, two hundred twenty-one thousand, three".