221303871 has 12 divisors (see below), whose sum is σ = 326463072. Its totient is φ = 144396576.

The previous prime is 221303857. The next prime is 221303893. The reversal of 221303871 is 178303122.

It is not a de Polignac number, because 221303871 - 2⁷ = 221303743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221303801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261166 + ... + 262011.

It is an arithmetic number, because the mean of its divisors is an integer number (27205256).

Almost surely, 2^221303871 is an apocalyptic number.

221303871 is a deficient number, since it is larger than the sum of its proper divisors (105159201).

221303871 is a wasteful number, since it uses less digits than its factorization.

221303871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523230 (or 523227 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 221303871 is about 14876.2855242833. The cubic root of 221303871 is about 604.8713347952.

Adding to 221303871 its reverse (178303122), we get a palindrome (399606993).

The spelling of 221303871 in words is "two hundred twenty-one million, three hundred three thousand, eight hundred seventy-one".