221320239 has 8 divisors (see below), whose sum is σ = 337249920. Its totient is φ = 126468696.

The previous prime is 221320223. The next prime is 221320243. The reversal of 221320239 is 932023122.

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

It is not a de Polignac number, because 221320239 - 2⁴ = 221320223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320219) 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 7 ways as a sum of consecutive naturals, for example, 5269509 + ... + 5269550.

It is an arithmetic number, because the mean of its divisors is an integer number (42156240).

Almost surely, 2^221320239 is an apocalyptic number.

221320239 is a deficient number, since it is larger than the sum of its proper divisors (115929681).

221320239 is a wasteful number, since it uses less digits than its factorization.

221320239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10539069.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 221320239 is about 14876.8356514415. The cubic root of 221320239 is about 604.8862468554.

The spelling of 221320239 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred thirty-nine".