20011011102001 has 4 divisors (see below), whose sum is σ = 20011074620404. Its totient is φ = 20010947583600.

The previous prime is 20011011101993. The next prime is 20011011102007. The reversal of 20011011102001 is 10020111011002.

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 8181201678400 + 11829809423601 = 2860280^2 + 3439449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011011102001 - 2³ = 20011011101993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011011102007) 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, 31284270 + ... + 31917511.

It is an arithmetic number, because the mean of its divisors is an integer number (5002768655101).

Almost surely, 2^{20011011102001} is an apocalyptic number.

It is an amenable number.

20011011102001 is a deficient number, since it is larger than the sum of its proper divisors (63518403).

20011011102001 is an equidigital number, since it uses as much as digits as its factorization.

20011011102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63518402.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20011011102001 its reverse (10020111011002), we get a palindrome (30031122113003).

Subtracting from 20011011102001 its reverse (10020111011002), we obtain a palindrome (9990900090999).

The spelling of 20011011102001 in words is "twenty trillion, eleven billion, eleven million, one hundred two thousand, one".