221440131 has 12 divisors (see below), whose sum is σ = 348936120. Its totient is φ = 134206080.

The previous prime is 221440127. The next prime is 221440133. The reversal of 221440131 is 131044122.

221440131 is a `hidden beast` number, since 221 + 440 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 221440131 - 2² = 221440127 is a prime.

It is a super-2 number, since 2×221440131² = 98071463234594322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221440133) 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, 1118286 + ... + 1118483.

It is an arithmetic number, because the mean of its divisors is an integer number (29078010).

Almost surely, 2^221440131 is an apocalyptic number.

221440131 is a deficient number, since it is larger than the sum of its proper divisors (127495989).

221440131 is a wasteful number, since it uses less digits than its factorization.

221440131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236786 (or 2236783 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221440131 is about 14880.8645918172. The cubic root of 221440131 is about 604.9954520069.

Adding to 221440131 its reverse (131044122), we get a palindrome (352484253).

The spelling of 221440131 in words is "two hundred twenty-one million, four hundred forty thousand, one hundred thirty-one".