131223002221 has 4 divisors (see below), whose sum is σ = 132180834492. Its totient is φ = 130265169952.

The previous prime is 131223002203. The next prime is 131223002243. The reversal of 131223002221 is 122200322131.

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 25996725225 + 105226276996 = 161235^2 + 324386^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223002221 - 2⁹ = 131223001709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223008221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478915930 + ... + 478916203.

It is an arithmetic number, because the mean of its divisors is an integer number (33045208623).

Almost surely, 2^131223002221 is an apocalyptic number.

It is an amenable number.

131223002221 is a deficient number, since it is larger than the sum of its proper divisors (957832271).

131223002221 is an equidigital number, since it uses as much as digits as its factorization.

131223002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957832270.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 131223002221 its reverse (122200322131), we get a palindrome (253423324352).

The spelling of 131223002221 in words is "one hundred thirty-one billion, two hundred twenty-three million, two thousand, two hundred twenty-one".