131221203 has 16 divisors (see below), whose sum is σ = 181022880. Its totient is φ = 84485376.

The previous prime is 131221193. The next prime is 131221213. The reversal of 131221203 is 302122131.

It is an interprime number because it is at equal distance from previous prime (131221193) and next prime (131221213).

It is a de Polignac number, because none of the positive numbers 2^k-131221203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131221213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10893 + ... + 19521.

It is an arithmetic number, because the mean of its divisors is an integer number (11313930).

Almost surely, 2^131221203 is an apocalyptic number.

131221203 is a deficient number, since it is larger than the sum of its proper divisors (49801677).

131221203 is a wasteful number, since it uses less digits than its factorization.

131221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8806.

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

The square root of 131221203 is about 11455.1823643275. The cubic root of 131221203 is about 508.1610084941.

Adding to 131221203 its reverse (302122131), we get a palindrome (433343334).

The spelling of 131221203 in words is "one hundred thirty-one million, two hundred twenty-one thousand, two hundred three".