1000221305 has 4 divisors (see below), whose sum is σ = 1200265572. Its totient is φ = 800177040.

The previous prime is 1000221251. The next prime is 1000221319. The reversal of 1000221305 is 5031220001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5031220001 = 17539 ⋅286859.

It can be written as a sum of positive squares in 2 ways, for example, as 623550841 + 376670464 = 24971^2 + 19408^2 .

It is not a de Polignac number, because 1000221305 - 2¹⁴ = 1000204921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000221305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100022126 + ... + 100022135.

It is an arithmetic number, because the mean of its divisors is an integer number (300066393).

Almost surely, 2^1000221305 is an apocalyptic number.

It is an amenable number.

1000221305 is a deficient number, since it is larger than the sum of its proper divisors (200044267).

1000221305 is an equidigital number, since it uses as much as digits as its factorization.

1000221305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200044266.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1000221305 is about 31626.2755473989. The cubic root of 1000221305 is about 1000.0737628922.

Adding to 1000221305 its reverse (5031220001), we get a palindrome (6031441306).

The spelling of 1000221305 in words is "one billion, two hundred twenty-one thousand, three hundred five".