221355408 has 20 divisors (see below), whose sum is σ = 571834928. Its totient is φ = 73785120.

The previous prime is 221355389. The next prime is 221355413. The reversal of 221355408 is 804553122.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 2305738 + ... + 2305833.

Almost surely, 2^221355408 is an apocalyptic number.

It is an amenable number.

221355408 is an abundant number, since it is smaller than the sum of its proper divisors (350479520).

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

221355408 is a wasteful number, since it uses less digits than its factorization.

221355408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611582 (or 4611576 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 221355408 is about 14878.0176098834. The cubic root of 221355408 is about 604.9182850727.

The spelling of 221355408 in words is "two hundred twenty-one million, three hundred fifty-five thousand, four hundred eight".