221153455 has 4 divisors (see below), whose sum is σ = 265384152. Its totient is φ = 176922760.

The previous prime is 221153447. The next prime is 221153503. The reversal of 221153455 is 554351122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221153455 - 2³ = 221153447 is a prime.

It is a Duffinian number.

It is a congruent 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, 22115341 + ... + 22115350.

It is an arithmetic number, because the mean of its divisors is an integer number (66346038).

Almost surely, 2^221153455 is an apocalyptic number.

221153455 is a deficient number, since it is larger than the sum of its proper divisors (44230697).

221153455 is an equidigital number, since it uses as much as digits as its factorization.

221153455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230696.

The product of its digits is 6000, while the sum is 28.

The square root of 221153455 is about 14871.2291018597. The cubic root of 221153455 is about 604.7342639176.

The spelling of 221153455 in words is "two hundred twenty-one million, one hundred fifty-three thousand, four hundred fifty-five".