131331303221 has 4 divisors (see below), whose sum is σ = 131508062112. Its totient is φ = 131154544332.

The previous prime is 131331303211. The next prime is 131331303223. The reversal of 131331303221 is 122303133131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122303133131 = 5237 ⋅23353663.

It is a cyclic number.

It is not a de Polignac number, because 131331303221 - 2²⁶ = 131264194357 is a prime.

It is a super-2 number, since 2×131331303221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131331303223) 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, 88378331 + ... + 88379816.

It is an arithmetic number, because the mean of its divisors is an integer number (32877015528).

Almost surely, 2^131331303221 is an apocalyptic number.

It is an amenable number.

131331303221 is a deficient number, since it is larger than the sum of its proper divisors (176758891).

131331303221 is an equidigital number, since it uses as much as digits as its factorization.

131331303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176758890.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 131331303221 its reverse (122303133131), we get a palindrome (253634436352).

The spelling of 131331303221 in words is "one hundred thirty-one billion, three hundred thirty-one million, three hundred three thousand, two hundred twenty-one".