221012205 has 8 divisors (see below), whose sum is σ = 353619552. Its totient is φ = 117873168.

The previous prime is 221012201. The next prime is 221012227. The reversal of 221012205 is 502210122.

221012205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221012205 - 2² = 221012201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 14734147 = 221012205 / (2 + 2 + 1 + 0 + 1 + 2 + 2 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012201) 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, 7367059 + ... + 7367088.

It is an arithmetic number, because the mean of its divisors is an integer number (44202444).

Almost surely, 2^221012205 is an apocalyptic number.

It is an amenable number.

221012205 is a deficient number, since it is larger than the sum of its proper divisors (132607347).

221012205 is a wasteful number, since it uses less digits than its factorization.

221012205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14734155.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221012205 is about 14866.4792402236. The cubic root of 221012205 is about 604.6054892216.

Adding to 221012205 its reverse (502210122), we get a palindrome (723222327).

The spelling of 221012205 in words is "two hundred twenty-one million, twelve thousand, two hundred five".