221224004 has 12 divisors (see below), whose sum is σ = 387288300. Its totient is φ = 110570208.

The previous prime is 221223997. The next prime is 221224013. The reversal of 221224004 is 400422122.

It is a happy number.

221224004 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141657604 + 79566400 = 11902^2 + 8920^2 .

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, 3542 + ... + 21330.

It is an arithmetic number, because the mean of its divisors is an integer number (32274025).

Almost surely, 2^221224004 is an apocalyptic number.

It is an amenable number.

221224004 is a deficient number, since it is larger than the sum of its proper divisors (166064296).

221224004 is a wasteful number, since it uses less digits than its factorization.

221224004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20902 (or 20900 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221224004 is about 14873.6009089931. The cubic root of 221224004 is about 604.7985614462.

Adding to 221224004 its reverse (400422122), we get a palindrome (621646126).

The spelling of 221224004 in words is "two hundred twenty-one million, two hundred twenty-four thousand, four".