221331004 has 12 divisors (see below), whose sum is σ = 387520504. Its totient is φ = 110610864.

The previous prime is 221330971. The next prime is 221331013. The reversal of 221331004 is 400133122.

It is a happy number.

It is a congruent number.

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, 3747 + ... + 21370.

Almost surely, 2^221331004 is an apocalyptic number.

It is an amenable number.

221331004 is a deficient number, since it is larger than the sum of its proper divisors (166189500).

221331004 is a wasteful number, since it uses less digits than its factorization.

221331004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27324 (or 27322 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221331004 is about 14877.1974511331. The cubic root of 221331004 is about 604.8960539038.

Adding to 221331004 its reverse (400133122), we get a palindrome (621464126).

The spelling of 221331004 in words is "two hundred twenty-one million, three hundred thirty-one thousand, four".