131323211221 has 8 divisors (see below), whose sum is σ = 138685242080. Its totient is φ = 124006208688.

The previous prime is 131323211207. The next prime is 131323211263. The reversal of 131323211221 is 122112323131.

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 131323211221 - 2⁷ = 131323211093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131323211192 and 131323211201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131323211281) 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, 11251086 + ... + 11262751.

It is an arithmetic number, because the mean of its divisors is an integer number (17335655260).

Almost surely, 2^131323211221 is an apocalyptic number.

It is an amenable number.

131323211221 is a deficient number, since it is larger than the sum of its proper divisors (7362030859).

131323211221 is a wasteful number, since it uses less digits than its factorization.

131323211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22514163.

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

Adding to 131323211221 its reverse (122112323131), we get a palindrome (253435534352).

The spelling of 131323211221 in words is "one hundred thirty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred twenty-one".