20011100211 has 6 divisors (see below), whose sum is σ = 28904922540. Its totient is φ = 13340733468.

The previous prime is 20011100177. The next prime is 20011100227. The reversal of 20011100211 is 11200111002.

It is a happy number.

It is not a de Polignac number, because 20011100211 - 2¹⁵ = 20011067443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2223455579 = 20011100211 / (2 + 0 + 0 + 1 + 1 + 1 + 0 + 0 + 2 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 20011100193 and 20011100202.

It is not an unprimeable number, because it can be changed into a prime (20011108211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111727781 + ... + 1111727798.

It is an arithmetic number, because the mean of its divisors is an integer number (4817487090).

Almost surely, 2^20011100211 is an apocalyptic number.

20011100211 is a deficient number, since it is larger than the sum of its proper divisors (8893822329).

20011100211 is a wasteful number, since it uses less digits than its factorization.

20011100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223455585 (or 2223455582 counting only the distinct ones).

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

Adding to 20011100211 its reverse (11200111002), we get a palindrome (31211211213).

It can be divided in two parts, 200111002 and 11, that multiplied together give a palindrome (2201221022).

The spelling of 20011100211 in words is "twenty billion, eleven million, one hundred thousand, two hundred eleven".