131221301123 has 12 divisors (see below), whose sum is σ = 144247150320. Its totient is φ = 119282029680.

The previous prime is 131221301083. The next prime is 131221301203. The reversal of 131221301123 is 321103122131.

It is a happy number.

It is not a de Polignac number, because 131221301123 - 2⁶ = 131221301059 is a prime.

It is a super-2 number, since 2×131221301123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221301095 and 131221301104.

It is not an unprimeable number, because it can be changed into a prime (131221301423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1654898 + ... + 1732376.

It is an arithmetic number, because the mean of its divisors is an integer number (12020595860).

Almost surely, 2^131221301123 is an apocalyptic number.

131221301123 is a deficient number, since it is larger than the sum of its proper divisors (13025849197).

131221301123 is a wasteful number, since it uses less digits than its factorization.

131221301123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91498 (or 91487 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131221301123 its reverse (321103122131), we get a palindrome (452324423254).

The spelling of 131221301123 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred one thousand, one hundred twenty-three".