221030131 has 6 divisors (see below), whose sum is σ = 257116740. Its totient is φ = 189454356.

The previous prime is 221030129. The next prime is 221030137. The reversal of 221030131 is 131030122.

It is not a de Polignac number, because 221030131 - 2¹ = 221030129 is a prime.

It is a super-2 number, since 2×221030131² = 97708637619754322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221030137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2255361 + ... + 2255458.

It is an arithmetic number, because the mean of its divisors is an integer number (42852790).

Almost surely, 2^221030131 is an apocalyptic number.

221030131 is a deficient number, since it is larger than the sum of its proper divisors (36086609).

221030131 is an equidigital number, since it uses as much as digits as its factorization.

221030131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510833 (or 4510826 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 221030131 is about 14867.0821279766. The cubic root of 221030131 is about 604.6218350233.

Adding to 221030131 its reverse (131030122), we get a palindrome (352060253).

Subtracting from 221030131 its reverse (131030122), we obtain a palindrome (90000009).

The spelling of 221030131 in words is "two hundred twenty-one million, thirty thousand, one hundred thirty-one".