20011101001 has 4 divisors (see below), whose sum is σ = 20011580100. Its totient is φ = 20010621904.

The previous prime is 20011100999. The next prime is 20011101023. The reversal of 20011101001 is 10010111002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10010111002 = 2 ⋅5005055501.

It can be written as a sum of positive squares in 2 ways, for example, as 19796771401 + 214329600 = 140701^2 + 14640^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011101001 - 2¹ = 20011100999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011101041) 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, 170206 + ... + 262663.

It is an arithmetic number, because the mean of its divisors is an integer number (5002895025).

Almost surely, 2^20011101001 is an apocalyptic number.

It is an amenable number.

20011101001 is a deficient number, since it is larger than the sum of its proper divisors (479099).

20011101001 is an equidigital number, since it uses as much as digits as its factorization.

20011101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479098.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 20011101001 its reverse (10010111002), we get a palindrome (30021212003).

The spelling of 20011101001 in words is "twenty billion, eleven million, one hundred one thousand, one".