221130131 has 4 divisors (see below), whose sum is σ = 221184264. Its totient is φ = 221076000.

The previous prime is 221130127. The next prime is 221130149. The reversal of 221130131 is 131031122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131031122 = 2 ⋅65515561.

It is a cyclic number.

It is not a de Polignac number, because 221130131 - 2² = 221130127 is a prime.

It is a super-2 number, since 2×221130131² = 97797069672154322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221130031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20390 + ... + 29291.

It is an arithmetic number, because the mean of its divisors is an integer number (55296066).

Almost surely, 2^221130131 is an apocalyptic number.

221130131 is a deficient number, since it is larger than the sum of its proper divisors (54133).

221130131 is an equidigital number, since it uses as much as digits as its factorization.

221130131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54132.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221130131 is about 14870.4448823833. Note that the first 3 decimals coincide. The cubic root of 221130131 is about 604.7130036908.

Adding to 221130131 its reverse (131031122), we get a palindrome (352161253).

Subtracting from 221130131 its reverse (131031122), we obtain a palindrome (90099009).

The spelling of 221130131 in words is "two hundred twenty-one million, one hundred thirty thousand, one hundred thirty-one".