221431113 has 12 divisors (see below), whose sum is σ = 319999680. Its totient is φ = 147549336.

The previous prime is 221431061. The next prime is 221431127. The reversal of 221431113 is 311134122.

221431113 is a `hidden beast` number, since 221 + 431 + 1 + 13 = 666.

It is not a de Polignac number, because 221431113 - 2¹³ = 221422921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221431213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19348 + ... + 28586.

It is an arithmetic number, because the mean of its divisors is an integer number (26666640).

Almost surely, 2^221431113 is an apocalyptic number.

It is an amenable number.

221431113 is a deficient number, since it is larger than the sum of its proper divisors (98568567).

221431113 is a wasteful number, since it uses less digits than its factorization.

221431113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11908 (or 11905 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 221431113 is about 14880.5615821447. The cubic root of 221431113 is about 604.9872392181.

Adding to 221431113 its reverse (311134122), we get a palindrome (532565235).

The spelling of 221431113 in words is "two hundred twenty-one million, four hundred thirty-one thousand, one hundred thirteen".