221242903 has 8 divisors (see below), whose sum is σ = 253095840. Its totient is φ = 189451680.

The previous prime is 221242873. The next prime is 221242907. The reversal of 221242903 is 309242122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221242903 - 2⁵ = 221242871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242907) 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 7 ways as a sum of consecutive naturals, for example, 7468 + ... + 22321.

It is an arithmetic number, because the mean of its divisors is an integer number (31636980).

Almost surely, 2^221242903 is an apocalyptic number.

221242903 is a deficient number, since it is larger than the sum of its proper divisors (31852937).

221242903 is a wasteful number, since it uses less digits than its factorization.

221242903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30857.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 221242903 is about 14874.2362156852. The cubic root of 221242903 is about 604.8157834509.

The spelling of 221242903 in words is "two hundred twenty-one million, two hundred forty-two thousand, nine hundred three".