221328970 has 8 divisors (see below), whose sum is σ = 398392164. Its totient is φ = 88531584.

The previous prime is 221328953. The next prime is 221328971. The reversal of 221328970 is 79823122.

It can be written as a sum of positive squares in 2 ways, for example, as 221146641 + 182329 = 14871^2 + 427^2 .

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

It is a super-2 number, since 2×221328970² = 97973025922521800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221328971) 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 3 ways as a sum of consecutive naturals, for example, 11066439 + ... + 11066458.

Almost surely, 2^221328970 is an apocalyptic number.

221328970 is a deficient number, since it is larger than the sum of its proper divisors (177063194).

221328970 is a wasteful number, since it uses less digits than its factorization.

221328970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22132904.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 221328970 is about 14877.1290913267. The cubic root of 221328970 is about 604.8942009290.

The spelling of 221328970 in words is "two hundred twenty-one million, three hundred twenty-eight thousand, nine hundred seventy".