131221313021002 has 12 divisors (see below), whose sum is σ = 205761964370130. Its totient is φ = 62758019270408.

The previous prime is 131221313020873. The next prime is 131221313021009. The reversal of 131221313021002 is 200120313122131.

It can be written as a sum of positive squares in only one way, i.e., 109394467190761 + 21826845830241 = 10459181^2 + 4671921^2 .

It is not an unprimeable number, because it can be changed into a prime (131221313021009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62013851977 + ... + 62013854092.

Almost surely, 2^{131221313021002} is an apocalyptic number.

131221313021002 is a deficient number, since it is larger than the sum of its proper divisors (74540651349128).

131221313021002 is a wasteful number, since it uses less digits than its factorization.

131221313021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124027706117 (or 124027706094 counting only the distinct ones).

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

Adding to 131221313021002 its reverse (200120313122131), we get a palindrome (331341626143133).

The spelling of 131221313021002 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, two".