131223311221 has 8 divisors (see below), whose sum is σ = 135326980800. Its totient is φ = 127182293280.

The previous prime is 131223311189. The next prime is 131223311237. The reversal of 131223311221 is 122113322131.

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 131223311221 - 2⁵ = 131223311189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223311192 and 131223311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223311291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15658656 + ... + 15667033.

It is an arithmetic number, because the mean of its divisors is an integer number (16915872600).

Almost surely, 2^131223311221 is an apocalyptic number.

It is an amenable number.

131223311221 is a deficient number, since it is larger than the sum of its proper divisors (4103669579).

131223311221 is an equidigital number, since it uses as much as digits as its factorization.

131223311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31325819.

The product of its digits is 432, while the sum is 22.

Adding to 131223311221 its reverse (122113322131), we get a palindrome (253336633352).

The spelling of 131223311221 in words is "one hundred thirty-one billion, two hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".