20001201011009 has 4 divisors (see below), whose sum is σ = 20111704884180. Its totient is φ = 19890697137840.

The previous prime is 20001201010873. The next prime is 20001201011017. The reversal of 20001201011009 is 90011010210002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7530238480384 + 12470962530625 = 2744128^2 + 3531425^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001201011009 - 2⁸ = 20001201010753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001201011039) 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, 55251936314 + ... + 55251936675.

It is an arithmetic number, because the mean of its divisors is an integer number (5027926221045).

Almost surely, 2^{20001201011009} is an apocalyptic number.

It is an amenable number.

20001201011009 is a deficient number, since it is larger than the sum of its proper divisors (110503873171).

20001201011009 is a wasteful number, since it uses less digits than its factorization.

20001201011009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110503873170.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20001201011009 in words is "twenty trillion, one billion, two hundred one million, eleven thousand, nine".