1001112221 has 4 divisors (see below), whose sum is σ = 1003372512. Its totient is φ = 998851932.

The previous prime is 1001112209. The next prime is 1001112241. The reversal of 1001112221 is 1222111001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001112221 - 2⁶ = 1001112157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001112241) 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, 1129481 + ... + 1130366.

It is an arithmetic number, because the mean of its divisors is an integer number (250843128).

Almost surely, 2^1001112221 is an apocalyptic number.

It is an amenable number.

1001112221 is a deficient number, since it is larger than the sum of its proper divisors (2260291).

1001112221 is an equidigital number, since it uses as much as digits as its factorization.

1001112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260290.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1001112221 is about 31640.3574726962. The cubic root of 1001112221 is about 1000.3706029698.

Adding to 1001112221 its reverse (1222111001), we get a palindrome (2223223222).

The spelling of 1001112221 in words is "one billion, one million, one hundred twelve thousand, two hundred twenty-one".