221545004 has 12 divisors (see below), whose sum is σ = 388396344. Its totient is φ = 110574624.

The previous prime is 221544991. The next prime is 221545013. The reversal of 221545004 is 400545122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46937 + ... + 51440.

It is an arithmetic number, because the mean of its divisors is an integer number (32366362).

Almost surely, 2^221545004 is an apocalyptic number.

It is an amenable number.

221545004 is a deficient number, since it is larger than the sum of its proper divisors (166851340).

221545004 is a wasteful number, since it uses less digits than its factorization.

221545004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98944 (or 98942 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 221545004 is about 14884.3879282959. The cubic root of 221545004 is about 605.0909445963.

The spelling of 221545004 in words is "two hundred twenty-one million, five hundred forty-five thousand, four".