221328402 has 32 divisors (see below), whose sum is σ = 462827520. Its totient is φ = 70427280.

The previous prime is 221328343. The next prime is 221328407. The reversal of 221328402 is 204823122.

It is not an unprimeable number, because it can be changed into a prime (221328407) 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 15 ways as a sum of consecutive naturals, for example, 84127 + ... + 86717.

It is an arithmetic number, because the mean of its divisors is an integer number (14463360).

Almost surely, 2^221328402 is an apocalyptic number.

221328402 is an abundant number, since it is smaller than the sum of its proper divisors (241499118).

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

221328402 is a wasteful number, since it uses less digits than its factorization.

221328402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 221328402 is about 14877.1100016099. The cubic root of 221328402 is about 604.8936834787.

The spelling of 221328402 in words is "two hundred twenty-one million, three hundred twenty-eight thousand, four hundred two".