131220322221 has 8 divisors (see below), whose sum is σ = 175014761184. Its totient is φ = 87453049040.

The previous prime is 131220322217. The next prime is 131220322229. The reversal of 131220322221 is 122223022131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131220322221 - 2² = 131220322217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220322229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6780171 + ... + 6799496.

It is an arithmetic number, because the mean of its divisors is an integer number (21876845148).

Almost surely, 2^131220322221 is an apocalyptic number.

It is an amenable number.

131220322221 is a deficient number, since it is larger than the sum of its proper divisors (43794438963).

131220322221 is a wasteful number, since it uses less digits than its factorization.

131220322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13582891.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 131220322221 its reverse (122223022131), we get a palindrome (253443344352).

The spelling of 131220322221 in words is "one hundred thirty-one billion, two hundred twenty million, three hundred twenty-two thousand, two hundred twenty-one".