2221451305 has 4 divisors (see below), whose sum is σ = 2665741572. Its totient is φ = 1777161040.

The previous prime is 2221451279. The next prime is 2221451317. The reversal of 2221451305 is 5031541222.

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 501939216 + 1719512089 = 22404^2 + 41467^2 .

It is not a de Polignac number, because 2221451305 - 2⁵ = 2221451273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221451305.

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, 222145126 + ... + 222145135.

It is an arithmetic number, because the mean of its divisors is an integer number (666435393).

Almost surely, 2^2221451305 is an apocalyptic number.

It is an amenable number.

2221451305 is a deficient number, since it is larger than the sum of its proper divisors (444290267).

2221451305 is an equidigital number, since it uses as much as digits as its factorization.

2221451305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444290266.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2221451305 is about 47132.2745578866. The cubic root of 2221451305 is about 1304.8049609920.

Adding to 2221451305 its reverse (5031541222), we get a palindrome (7252992527).

The spelling of 2221451305 in words is "two billion, two hundred twenty-one million, four hundred fifty-one thousand, three hundred five".