221828403 has 6 divisors (see below), whose sum is σ = 295805604. Its totient is φ = 147868404.

The previous prime is 221828371. The next prime is 221828423. The reversal of 221828403 is 304828122.

It is not a de Polignac number, because 221828403 - 2⁵ = 221828371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221828423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21498 + ... + 30096.

It is an arithmetic number, because the mean of its divisors is an integer number (49300934).

Almost surely, 2^221828403 is an apocalyptic number.

221828403 is a deficient number, since it is larger than the sum of its proper divisors (73977201).

221828403 is an frugal number, since it uses more digits than its factorization.

221828403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17201 (or 8602 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 221828403 is about 14893.9048942848. The cubic root of 221828403 is about 605.3488441920.

The spelling of 221828403 in words is "two hundred twenty-one million, eight hundred twenty-eight thousand, four hundred three".