222121205 has 4 divisors (see below), whose sum is σ = 266545452. Its totient is φ = 177696960.

The previous prime is 222121199. The next prime is 222121217. The reversal of 222121205 is 502121222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90193009 + 131928196 = 9497^2 + 11486^2 .

It is not a de Polignac number, because 222121205 - 2¹² = 222117109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22212116 + ... + 22212125.

It is an arithmetic number, because the mean of its divisors is an integer number (66636363).

Almost surely, 2^222121205 is an apocalyptic number.

It is an amenable number.

222121205 is a deficient number, since it is larger than the sum of its proper divisors (44424247).

222121205 is an equidigital number, since it uses as much as digits as its factorization.

222121205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44424246.

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

The square root of 222121205 is about 14903.7312442220. The cubic root of 222121205 is about 605.6150701294.

Adding to 222121205 its sum of digits (17), we get a palindrome (222121222).

Adding to 222121205 its reverse (502121222), we get a palindrome (724242427).

The spelling of 222121205 in words is "two hundred twenty-two million, one hundred twenty-one thousand, two hundred five".