221454355 has 4 divisors (see below), whose sum is σ = 265745232. Its totient is φ = 177163480.

The previous prime is 221454307. The next prime is 221454397. The reversal of 221454355 is 553454122.

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

It is not a de Polignac number, because 221454355 - 2⁷ = 221454227 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 3 ways as a sum of consecutive naturals, for example, 22145431 + ... + 22145440.

It is an arithmetic number, because the mean of its divisors is an integer number (66436308).

Almost surely, 2^221454355 is an apocalyptic number.

221454355 is a deficient number, since it is larger than the sum of its proper divisors (44290877).

221454355 is an equidigital number, since it uses as much as digits as its factorization.

221454355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44290876.

The product of its digits is 24000, while the sum is 31.

The square root of 221454355 is about 14881.3425133622. The cubic root of 221454355 is about 605.0084055021.

The spelling of 221454355 in words is "two hundred twenty-one million, four hundred fifty-four thousand, three hundred fifty-five".