9001221009 has 16 divisors (see below), whose sum is σ = 13171092480. Its totient is φ = 5422615760.

The previous prime is 9001220989. The next prime is 9001221011.

9001221009 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9001221009 - 2⁷ = 9001220881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9001221009.

It is not an unprimeable number, because it can be changed into a prime (9001221059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811149 + ... + 822170.

It is an arithmetic number, because the mean of its divisors is an integer number (823193280).

Almost surely, 2^9001221009 is an apocalyptic number.

It is an amenable number.

9001221009 is a deficient number, since it is larger than the sum of its proper divisors (4169871471).

9001221009 is a wasteful number, since it uses less digits than its factorization.

9001221009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633500.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 9001221009 is about 94874.7648692739. The cubic root of 9001221009 is about 2080.1778855045.

The spelling of 9001221009 in words is "nine billion, one million, two hundred twenty-one thousand, nine".