131221313021001 has 32 divisors (see below), whose sum is σ = 201469278216960. Its totient is φ = 74416526078976.

The previous prime is 131221313020873. The next prime is 131221313021009. The reversal of 131221313021001 is 100120313122131.

It is not a de Polignac number, because 131221313021001 - 2⁷ = 131221313020873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31 ways as a sum of consecutive naturals, for example, 4792675 + ... + 16894151.

It is an arithmetic number, because the mean of its divisors is an integer number (6295914944280).

Almost surely, 2^{131221313021001} is an apocalyptic number.

It is an amenable number.

131221313021001 is a deficient number, since it is larger than the sum of its proper divisors (70247965195959).

131221313021001 is a wasteful number, since it uses less digits than its factorization.

131221313021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12105393.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 131221313021001 its reverse (100120313122131), we get a palindrome (231341626143132).

The spelling of 131221313021001 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, one".