20011100201 has 4 divisors (see below), whose sum is σ = 20114784852. Its totient is φ = 19907415552.

The previous prime is 20011100177. The next prime is 20011100227. The reversal of 20011100201 is 10200111002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10200111002 = 2 ⋅5100055501.

It can be written as a sum of positive squares in 2 ways, for example, as 9623413801 + 10387686400 = 98099^2 + 101920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011100201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011100701) 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, 51842036 + ... + 51842421.

It is an arithmetic number, because the mean of its divisors is an integer number (5028696213).

Almost surely, 2^20011100201 is an apocalyptic number.

It is an amenable number.

20011100201 is a deficient number, since it is larger than the sum of its proper divisors (103684651).

20011100201 is a wasteful number, since it uses less digits than its factorization.

20011100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103684650.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20011100201 its reverse (10200111002), we get a palindrome (30211211203).

The spelling of 20011100201 in words is "twenty billion, eleven million, one hundred thousand, two hundred one".