1001201221009 has 4 divisors (see below), whose sum is σ = 1092219513840. Its totient is φ = 910182928180.

The previous prime is 1001201220997. The next prime is 1001201221049. The reversal of 1001201221009 is 9001221021001.

It is a happy number.

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 1001201221009 - 2¹⁵ = 1001201188241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001201221049) 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, 45509146399 + ... + 45509146420.

It is an arithmetic number, because the mean of its divisors is an integer number (273054878460).

Almost surely, 2^{1001201221009} is an apocalyptic number.

It is an amenable number.

1001201221009 is a deficient number, since it is larger than the sum of its proper divisors (91018292831).

1001201221009 is an equidigital number, since it uses as much as digits as its factorization.

1001201221009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91018292830.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1001201221009 in words is "one trillion, one billion, two hundred one million, two hundred twenty-one thousand, nine".