221055306 has 8 divisors (see below), whose sum is σ = 442110624. Its totient is φ = 73685100.

The previous prime is 221055299. The next prime is 221055343. The reversal of 221055306 is 603550122.

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

221055306 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18421270 + ... + 18421281.

It is an arithmetic number, because the mean of its divisors is an integer number (55263828).

Almost surely, 2^221055306 is an apocalyptic number.

221055306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221055306 is a wasteful number, since it uses less digits than its factorization.

221055306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36842556.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 221055306 is about 14867.9287730336. The cubic root of 221055306 is about 604.6447893248.

The spelling of 221055306 in words is "two hundred twenty-one million, fifty-five thousand, three hundred six".