12131302221 has 48 divisors (see below), whose sum is σ = 19173570624. Its totient is φ = 7360077312.

The previous prime is 12131302219. The next prime is 12131302223. The reversal of 12131302221 is 12220313121.

12131302221 is a `hidden beast` number, since 12 + 131 + 302 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (12131302219) and next prime (12131302223).

It is not a de Polignac number, because 12131302221 - 2¹ = 12131302219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12131302194 and 12131302203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131302223) 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 47 ways as a sum of consecutive naturals, for example, 916170 + ... + 929316.

It is an arithmetic number, because the mean of its divisors is an integer number (399449388).

Almost surely, 2^12131302221 is an apocalyptic number.

It is an amenable number.

12131302221 is a deficient number, since it is larger than the sum of its proper divisors (7042268403).

12131302221 is a wasteful number, since it uses less digits than its factorization.

12131302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13370 (or 13367 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12131302221 its reverse (12220313121), we get a palindrome (24351615342).

The spelling of 12131302221 in words is "twelve billion, one hundred thirty-one million, three hundred two thousand, two hundred twenty-one".