20001000011001 has 64 divisors (see below), whose sum is σ = 27966373134336. Its totient is φ = 12704590886400.

The previous prime is 20001000010973. The next prime is 20001000011009. The reversal of 20001000011001 is 10011000010002.

It is not a de Polignac number, because 20001000011001 - 2⁵ = 20001000010969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001000011009) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 359114566 + ... + 359170256.

It is an arithmetic number, because the mean of its divisors is an integer number (436974580224).

Almost surely, 2^{20001000011001} is an apocalyptic number.

It is an amenable number.

20001000011001 is a deficient number, since it is larger than the sum of its proper divisors (7965373123335).

20001000011001 is a wasteful number, since it uses less digits than its factorization.

20001000011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56222.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 20001000011001 its reverse (10011000010002), we get a palindrome (30012000021003).

Subtracting from 20001000011001 its reverse (10011000010002), we obtain a palindrome (9990000000999).

The spelling of 20001000011001 in words is "twenty trillion, one billion, eleven thousand, one".