221312104 has 16 divisors (see below), whose sum is σ = 446880420. Its totient is φ = 102144000.

The previous prime is 221312081. The next prime is 221312149. The reversal of 221312104 is 401213122.

It can be written as a sum of positive squares in 2 ways, for example, as 162052900 + 59259204 = 12730^2 + 7698^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063897 + ... + 1064104.

Almost surely, 2^221312104 is an apocalyptic number.

It is an amenable number.

221312104 is an abundant number, since it is smaller than the sum of its proper divisors (225568316).

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

221312104 is a wasteful number, since it uses less digits than its factorization.

221312104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128020 (or 2128016 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221312104 is about 14876.5622372912. The cubic root of 221312104 is about 604.8788355587.

Adding to 221312104 its reverse (401213122), we get a palindrome (622525226).

The spelling of 221312104 in words is "two hundred twenty-one million, three hundred twelve thousand, one hundred four".