131000521221 has 48 divisors (see below), whose sum is σ = 201867822000. Its totient is φ = 81576198144.

The previous prime is 131000521219. The next prime is 131000521229. The reversal of 131000521221 is 122125000131.

It can be written as a sum of positive squares in 8 ways, for example, as 48336221025 + 82664300196 = 219855^2 + 287514^2 .

It is not a de Polignac number, because 131000521221 - 2¹ = 131000521219 is a prime.

It is a super-2 number, since 2×131000521221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131000521194 and 131000521203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131000521229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48715845 + ... + 48718533.

It is an arithmetic number, because the mean of its divisors is an integer number (4205579625).

Almost surely, 2^131000521221 is an apocalyptic number.

It is an amenable number.

131000521221 is a deficient number, since it is larger than the sum of its proper divisors (70867300779).

131000521221 is a wasteful number, since it uses less digits than its factorization.

131000521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998 (or 4995 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 131000521221 its reverse (122125000131), we get a palindrome (253125521352).

The spelling of 131000521221 in words is "one hundred thirty-one billion, five hundred twenty-one thousand, two hundred twenty-one".