131020221 has 8 divisors (see below), whose sum is σ = 175245984. Its totient is φ = 87070640.

The previous prime is 131020199. The next prime is 131020237. The reversal of 131020221 is 122020131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131020221 - 2⁷ = 131020093 is a prime.

It is a super-3 number, since 3×131020221³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131020197 and 131020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131020271) 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 7 ways as a sum of consecutive naturals, for example, 67935 + ... + 69836.

It is an arithmetic number, because the mean of its divisors is an integer number (21905748).

Almost surely, 2^131020221 is an apocalyptic number.

It is an amenable number.

131020221 is a deficient number, since it is larger than the sum of its proper divisors (44225763).

131020221 is a wasteful number, since it uses less digits than its factorization.

131020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138091.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 131020221 is about 11446.4064666602. The cubic root of 131020221 is about 507.9014381396.

Adding to 131020221 its reverse (122020131), we get a palindrome (253040352).

The spelling of 131020221 in words is "one hundred thirty-one million, twenty thousand, two hundred twenty-one".