221270928 has 40 divisors (see below), whose sum is σ = 591331200. Its totient is φ = 71213184.

The previous prime is 221270927. The next prime is 221270939. The reversal of 221270928 is 829072122.

221270928 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221270923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78088 + ... + 80871.

It is an arithmetic number, because the mean of its divisors is an integer number (14783280).

Almost surely, 2^221270928 is an apocalyptic number.

It is an amenable number.

221270928 is an abundant number, since it is smaller than the sum of its proper divisors (370060272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221270928 is a wasteful number, since it uses less digits than its factorization.

221270928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158999 (or 158993 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 221270928 is about 14875.1782510328. The cubic root of 221270928 is about 604.8413198583.

The spelling of 221270928 in words is "two hundred twenty-one million, two hundred seventy thousand, nine hundred twenty-eight".