1001201212109 has 16 divisors (see below), whose sum is σ = 1195785534720. Its totient is φ = 819618687360.

The previous prime is 1001201212013. The next prime is 1001201212139. The reversal of 1001201212109 is 9012121021001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001201212109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001201212139) 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, 4597544 + ... + 4810385.

It is an arithmetic number, because the mean of its divisors is an integer number (74736595920).

Almost surely, 2^{1001201212109} is an apocalyptic number.

It is an amenable number.

1001201212109 is a deficient number, since it is larger than the sum of its proper divisors (194584322611).

1001201212109 is an equidigital number, since it uses as much as digits as its factorization.

1001201212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9408620.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1001201212109 in words is "one trillion, one billion, two hundred one million, two hundred twelve thousand, one hundred nine".