1001105221 has 4 divisors (see below), whose sum is σ = 1017516844. Its totient is φ = 984693600.

The previous prime is 1001105177. The next prime is 1001105243. The reversal of 1001105221 is 1225011001.

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 9548100 + 991557121 = 3090^2 + 31489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001105221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001105321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8205720 + ... + 8205841.

It is an arithmetic number, because the mean of its divisors is an integer number (254379211).

Almost surely, 2^1001105221 is an apocalyptic number.

It is an amenable number.

1001105221 is a deficient number, since it is larger than the sum of its proper divisors (16411623).

1001105221 is an equidigital number, since it uses as much as digits as its factorization.

1001105221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16411622.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1001105221 is about 31640.2468542835. The cubic root of 1001105221 is about 1000.3682713596.

Adding to 1001105221 its reverse (1225011001), we get a palindrome (2226116222).

The spelling of 1001105221 in words is "one billion, one million, one hundred five thousand, two hundred twenty-one".