221204105 has 8 divisors (see below), whose sum is σ = 265529664. Its totient is φ = 176906800.

The previous prime is 221204077. The next prime is 221204107. The reversal of 221204105 is 501402122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221204105 - 2¹² = 221200009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221204107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18740 + ... + 28170.

It is an arithmetic number, because the mean of its divisors is an integer number (33191208).

Almost surely, 2^221204105 is an apocalyptic number.

It is an amenable number.

221204105 is a deficient number, since it is larger than the sum of its proper divisors (44325559).

221204105 is an equidigital number, since it uses as much as digits as its factorization.

221204105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14127.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221204105 is about 14872.9319570823. The cubic root of 221204105 is about 604.7804271160.

Adding to 221204105 its reverse (501402122), we get a palindrome (722606227).

The spelling of 221204105 in words is "two hundred twenty-one million, two hundred four thousand, one hundred five".