221244444 has 36 divisors (see below), whose sum is σ = 561049944. Its totient is φ = 73511712.

The previous prime is 221244431. The next prime is 221244461. The reversal of 221244444 is 444442122.

221244444 is a `hidden beast` number, since 2 + 212 + 4 + 4 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

221244444 is a modest number, since divided by 44444 gives 2212 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1719 + ... + 21105.

Almost surely, 2^221244444 is an apocalyptic number.

It is an amenable number.

221244444 is an abundant number, since it is smaller than the sum of its proper divisors (339805500).

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

221244444 is a wasteful number, since it uses less digits than its factorization.

221244444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19714 (or 19709 counting only the distinct ones).

The product of its digits is 8192, while the sum is 27.

The square root of 221244444 is about 14874.2880165741. The cubic root of 221244444 is about 604.8171876677.

Adding to 221244444 its reverse (444442122), we get a palindrome (665686566).

It can be divided in two parts, 2212 and 44444, that added together give a 6-th power (46656 = 6⁶).

The spelling of 221244444 in words is "two hundred twenty-one million, two hundred forty-four thousand, four hundred forty-four".