1001244221 has 4 divisors (see below), whose sum is σ = 1001597532. Its totient is φ = 1000890912.

The previous prime is 1001244203. The next prime is 1001244259. The reversal of 1001244221 is 1224421001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224421001 = 43 ⋅28474907.

It can be written as a sum of positive squares in 2 ways, for example, as 551592196 + 449652025 = 23486^2 + 21205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001244221 - 2²⁶ = 934135357 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 1001244221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001244721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172370 + ... + 178083.

It is an arithmetic number, because the mean of its divisors is an integer number (250399383).

Almost surely, 2^1001244221 is an apocalyptic number.

It is an amenable number.

1001244221 is a deficient number, since it is larger than the sum of its proper divisors (353311).

1001244221 is an equidigital number, since it uses as much as digits as its factorization.

1001244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353310.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1001244221 is about 31642.4433475040. The cubic root of 1001244221 is about 1000.4145684426.

Adding to 1001244221 its reverse (1224421001), we get a palindrome (2225665222).

The spelling of 1001244221 in words is "one billion, one million, two hundred forty-four thousand, two hundred twenty-one".