2221251205 has 4 divisors (see below), whose sum is σ = 2665501452. Its totient is φ = 1777000960.

The previous prime is 2221251203. The next prime is 2221251233. The reversal of 2221251205 is 5021521222.

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 1220035041 + 1001216164 = 34929^2 + 31642^2 .

It is not a de Polignac number, because 2221251205 - 2¹ = 2221251203 is a prime.

It is a super-3 number, since 3×2221251205³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221251203) by changing a digit.

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, 222125116 + ... + 222125125.

It is an arithmetic number, because the mean of its divisors is an integer number (666375363).

Almost surely, 2^2221251205 is an apocalyptic number.

It is an amenable number.

2221251205 is a deficient number, since it is larger than the sum of its proper divisors (444250247).

2221251205 is an equidigital number, since it uses as much as digits as its factorization.

2221251205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444250246.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2221251205 is about 47130.1517608420. The cubic root of 2221251205 is about 1304.7657825036.

Adding to 2221251205 its reverse (5021521222), we get a palindrome (7242772427).

The spelling of 2221251205 in words is "two billion, two hundred twenty-one million, two hundred fifty-one thousand, two hundred five".