221250355 has 16 divisors (see below), whose sum is σ = 274964544. Its totient is φ = 170801280.

The previous prime is 221250349. The next prime is 221250397. The reversal of 221250355 is 553052122.

It is a happy number.

It is not a de Polignac number, because 221250355 - 2¹⁵ = 221217587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 9322 + ... + 23008.

It is an arithmetic number, because the mean of its divisors is an integer number (17185284).

Almost surely, 2^221250355 is an apocalyptic number.

221250355 is a deficient number, since it is larger than the sum of its proper divisors (53714189).

221250355 is a wasteful number, since it uses less digits than its factorization.

221250355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13806.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 221250355 is about 14874.4867138332. The cubic root of 221250355 is about 604.8225739311.

The spelling of 221250355 in words is "two hundred twenty-one million, two hundred fifty thousand, three hundred fifty-five".