131221310223 has 8 divisors (see below), whose sum is σ = 175034324736. Its totient is φ = 87444584600.

The previous prime is 131221310173. The next prime is 131221310279. The reversal of 131221310223 is 322013122131.

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 131221310223 - 2¹³ = 131221302031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131221310223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221310293) 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, 9063783 + ... + 9078248.

It is an arithmetic number, because the mean of its divisors is an integer number (21879290592).

Almost surely, 2^131221310223 is an apocalyptic number.

131221310223 is a deficient number, since it is larger than the sum of its proper divisors (43813014513).

131221310223 is a wasteful number, since it uses less digits than its factorization.

131221310223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18144445.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 131221310223 its reverse (322013122131), we get a palindrome (453234432354).

The spelling of 131221310223 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred ten thousand, two hundred twenty-three".