131221121303 has 4 divisors (see below), whose sum is σ = 133372287288. Its totient is φ = 129069955320.

The previous prime is 131221121299. The next prime is 131221121309. The reversal of 131221121303 is 303121122131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131221121303 - 2² = 131221121299 is a prime.

It is a super-3 number, since 3×131221121303³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221121309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075582901 + ... + 1075583022.

It is an arithmetic number, because the mean of its divisors is an integer number (33343071822).

Almost surely, 2^131221121303 is an apocalyptic number.

131221121303 is a deficient number, since it is larger than the sum of its proper divisors (2151165985).

131221121303 is an equidigital number, since it uses as much as digits as its factorization.

131221121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151165984.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131221121303 its reverse (303121122131), we get a palindrome (434342243434).

The spelling of 131221121303 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred three".