1000221121209 has 16 divisors (see below), whose sum is σ = 1337686382592. Its totient is φ = 664787850768.

The previous prime is 1000221121189. The next prime is 1000221121243. The reversal of 1000221121209 is 9021211220001.

It is not a de Polignac number, because 1000221121209 - 2²³ = 1000212732601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1000221121279) 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, 1032352 + ... + 1751054.

It is an arithmetic number, because the mean of its divisors is an integer number (83605398912).

Almost surely, 2^{1000221121209} is an apocalyptic number.

It is an amenable number.

1000221121209 is a deficient number, since it is larger than the sum of its proper divisors (337465261383).

1000221121209 is an equidigital number, since it uses as much as digits as its factorization.

1000221121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720116.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 1000221121209 in words is "one trillion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred nine".