20102111211 has 32 divisors (see below), whose sum is σ = 33879666688. Its totient is φ = 10316730240.

The previous prime is 20102111189. The next prime is 20102111257. The reversal of 20102111211 is 11211120102.

It is not a de Polignac number, because 20102111211 - 2¹⁰ = 20102110187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20102111111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 984955 + ... + 1005156.

It is an arithmetic number, because the mean of its divisors is an integer number (1058739584).

Almost surely, 2^20102111211 is an apocalyptic number.

20102111211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20102111211 is a deficient number, since it is larger than the sum of its proper divisors (13777555477).

20102111211 is a wasteful number, since it uses less digits than its factorization.

20102111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990171.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20102111211 its reverse (11211120102), we get a palindrome (31313231313).

The spelling of 20102111211 in words is "twenty billion, one hundred two million, one hundred eleven thousand, two hundred eleven".