131123333221 has 4 divisors (see below), whose sum is σ = 135644827500. Its totient is φ = 126601838944.

The previous prime is 131123333207. The next prime is 131123333269. The reversal of 131123333221 is 122333321131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 108590020900 + 22533312321 = 329530^2 + 150111^2 .

It is a cyclic number.

It is not a de Polignac number, because 131123333221 - 2⁷ = 131123333093 is a prime.

It is a super-3 number, since 3×131123333221³ (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 (131123333021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2260747096 + ... + 2260747153.

It is an arithmetic number, because the mean of its divisors is an integer number (33911206875).

Almost surely, 2^131123333221 is an apocalyptic number.

It is an amenable number.

131123333221 is a deficient number, since it is larger than the sum of its proper divisors (4521494279).

131123333221 is an equidigital number, since it uses as much as digits as its factorization.

131123333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521494278.

The product of its digits is 1944, while the sum is 25.

Adding to 131123333221 its reverse (122333321131), we get a palindrome (253456654352).

The spelling of 131123333221 in words is "one hundred thirty-one billion, one hundred twenty-three million, three hundred thirty-three thousand, two hundred twenty-one".