221328047 has 4 divisors (see below), whose sum is σ = 221377416. Its totient is φ = 221278680.

The previous prime is 221328007. The next prime is 221328061. The reversal of 221328047 is 740823122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221328047 - 2⁶ = 221327983 is a prime.

It is a super-2 number, since 2×221328047² = 97972208777668418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221328007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17204 + ... + 27177.

It is an arithmetic number, because the mean of its divisors is an integer number (55344354).

Almost surely, 2^221328047 is an apocalyptic number.

221328047 is a deficient number, since it is larger than the sum of its proper divisors (49369).

221328047 is an equidigital number, since it uses as much as digits as its factorization.

221328047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49368.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 221328047 is about 14877.0980705244. The cubic root of 221328047 is about 604.8933600719.

The spelling of 221328047 in words is "two hundred twenty-one million, three hundred twenty-eight thousand, forty-seven".