131003521221 has 16 divisors (see below), whose sum is σ = 175481841600. Its totient is φ = 86930621568.

The previous prime is 131003521217. The next prime is 131003521237. The reversal of 131003521221 is 122125300131.

It is not a de Polignac number, because 131003521221 - 2² = 131003521217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131003571221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3241225 + ... + 3281393.

It is an arithmetic number, because the mean of its divisors is an integer number (10967615100).

Almost surely, 2^131003521221 is an apocalyptic number.

It is an amenable number.

131003521221 is a deficient number, since it is larger than the sum of its proper divisors (44478320379).

131003521221 is a wasteful number, since it uses less digits than its factorization.

131003521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45188.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 131003521221 its reverse (122125300131), we get a palindrome (253128821352).

The spelling of 131003521221 in words is "one hundred thirty-one billion, three million, five hundred twenty-one thousand, two hundred twenty-one".