221844378 has 32 divisors (see below), whose sum is σ = 520781184. Its totient is φ = 61670592.

The previous prime is 221844377. The next prime is 221844391. The reversal of 221844378 is 873448122.

221844378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221844377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69825 + ... + 72932.

It is an arithmetic number, because the mean of its divisors is an integer number (16274412).

Almost surely, 2^221844378 is an apocalyptic number.

221844378 is an abundant number, since it is smaller than the sum of its proper divisors (298936806).

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

221844378 is a wasteful number, since it uses less digits than its factorization.

221844378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142806.

The product of its digits is 86016, while the sum is 39.

The square root of 221844378 is about 14894.4411778354. The cubic root of 221844378 is about 605.3633752672.

It can be divided in two parts, 221844 and 378, that added together give a palindrome (222222).

The spelling of 221844378 in words is "two hundred twenty-one million, eight hundred forty-four thousand, three hundred seventy-eight".