221031113 has 4 divisors (see below), whose sum is σ = 221853060. Its totient is φ = 220209168.

The previous prime is 221031101. The next prime is 221031119. The reversal of 221031113 is 311130122.

221031113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131974144 + 89056969 = 11488^2 + 9437^2 .

It is a cyclic number.

It is not a de Polignac number, because 221031113 - 2⁶ = 221031049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221031119) 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, 410570 + ... + 411107.

It is an arithmetic number, because the mean of its divisors is an integer number (55463265).

Almost surely, 2^221031113 is an apocalyptic number.

It is an amenable number.

221031113 is a deficient number, since it is larger than the sum of its proper divisors (821947).

221031113 is an equidigital number, since it uses as much as digits as its factorization.

221031113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821946.

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

The square root of 221031113 is about 14867.1151539228. The cubic root of 221031113 is about 604.6227304333.

Adding to 221031113 its reverse (311130122), we get a palindrome (532161235).

Subtracting 221031113 from its reverse (311130122), we obtain a palindrome (90099009).

The spelling of 221031113 in words is "two hundred twenty-one million, thirty-one thousand, one hundred thirteen".