20001102011001 has 10 divisors (see below), whose sum is σ = 29878189423962. Its totient is φ = 13334068007280.

The previous prime is 20001102010991. The next prime is 20001102011063. The reversal of 20001102011001 is 10011020110002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13509307601001 + 6491794410000 = 3675501^2 + 2547900^2 .

It is not a de Polignac number, because 20001102011001 - 2⁷ = 20001102010873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20001102011801) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 123463592580 + ... + 123463592741.

Almost surely, 2^{20001102011001} is an apocalyptic number.

It is an amenable number.

20001102011001 is a deficient number, since it is larger than the sum of its proper divisors (9877087412961).

20001102011001 is an equidigital number, since it uses as much as digits as its factorization.

20001102011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246927185333 (or 246927185324 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20001102011001 its reverse (10011020110002), we get a palindrome (30012122121003).

The spelling of 20001102011001 in words is "twenty trillion, one billion, one hundred two million, eleven thousand, one".