221020113 has 4 divisors (see below), whose sum is σ = 294693488. Its totient is φ = 147346740.

The previous prime is 221020099. The next prime is 221020127. The reversal of 221020113 is 311020122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (221020099) and next prime (221020127).

It is not a de Polignac number, because 221020113 - 2¹⁰ = 221019089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36836683 + ... + 36836688.

It is an arithmetic number, because the mean of its divisors is an integer number (73673372).

Almost surely, 2^221020113 is an apocalyptic number.

It is an amenable number.

221020113 is a deficient number, since it is larger than the sum of its proper divisors (73673375).

221020113 is an equidigital number, since it uses as much as digits as its factorization.

221020113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73673374.

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

The square root of 221020113 is about 14866.7452053232. The cubic root of 221020113 is about 604.6127002309.

Adding to 221020113 its reverse (311020122), we get a palindrome (532040235).

Subtracting 221020113 from its reverse (311020122), we obtain a palindrome (90000009).

The spelling of 221020113 in words is "two hundred twenty-one million, twenty thousand, one hundred thirteen".