1000001221009 has 16 divisors (see below), whose sum is σ = 1203039953280. Its totient is φ = 812010165120.

The previous prime is 1000001221001. The next prime is 1000001221027. The reversal of 1000001221009 is 9001221000001.

It is not a de Polignac number, because 1000001221009 - 2³ = 1000001221001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000001220983 and 1000001221001.

It is not an unprimeable number, because it can be changed into a prime (1000001221001) 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, 7087269 + ... + 7226989.

It is an arithmetic number, because the mean of its divisors is an integer number (75189997080).

Almost surely, 2^{1000001221009} is an apocalyptic number.

1000001221009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1000001221009 is a deficient number, since it is larger than the sum of its proper divisors (203038732271).

1000001221009 is a wasteful number, since it uses less digits than its factorization.

1000001221009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193560.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 1000001221009 in words is "one trillion, one million, two hundred twenty-one thousand, nine".