221055307 has 8 divisors (see below), whose sum is σ = 241838640. Its totient is φ = 200386560.

The previous prime is 221055299. The next prime is 221055343. The reversal of 221055307 is 703550122.

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

It is not a de Polignac number, because 221055307 - 2³ = 221055299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221055347) 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 7 ways as a sum of consecutive naturals, for example, 24582 + ... + 32347.

It is an arithmetic number, because the mean of its divisors is an integer number (30229830).

Almost surely, 2^221055307 is an apocalyptic number.

221055307 is a deficient number, since it is larger than the sum of its proper divisors (20783333).

221055307 is a wasteful number, since it uses less digits than its factorization.

221055307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57293.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 221055307 is about 14867.9288066630. The cubic root of 221055307 is about 604.6447902366.

The spelling of 221055307 in words is "two hundred twenty-one million, fifty-five thousand, three hundred seven".