221441004 has 36 divisors (see below), whose sum is σ = 574885584. Its totient is φ = 71818272.

The previous prime is 221440981. The next prime is 221441053. The reversal of 221441004 is 400144122.

221441004 is a `hidden beast` number, since 221 + 441 + 0 + 0 + 4 = 666.

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

It is a super-2 number, since 2×221441004² = 98072236505056032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81792 + ... + 84455.

It is an arithmetic number, because the mean of its divisors is an integer number (15969044).

Almost surely, 2^221441004 is an apocalyptic number.

It is an amenable number.

221441004 is an abundant number, since it is smaller than the sum of its proper divisors (353444580).

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

221441004 is a wasteful number, since it uses less digits than its factorization.

221441004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166294 (or 166289 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221441004 is about 14880.8939247614. The cubic root of 221441004 is about 604.9962470455.

Adding to 221441004 its reverse (400144122), we get a palindrome (621585126).

The spelling of 221441004 in words is "two hundred twenty-one million, four hundred forty-one thousand, four".