20211000111 has 24 divisors (see below), whose sum is σ = 29335644624. Its totient is φ = 13408554240.

The previous prime is 20211000097. The next prime is 20211000167. The reversal of 20211000111 is 11100011202.

It is a happy number.

It is not a de Polignac number, because 20211000111 - 2⁷ = 20210999983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20211000093 and 20211000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4394265 + ... + 4398861.

It is an arithmetic number, because the mean of its divisors is an integer number (1222318526).

Almost surely, 2^20211000111 is an apocalyptic number.

20211000111 is a deficient number, since it is larger than the sum of its proper divisors (9124644513).

20211000111 is a wasteful number, since it uses less digits than its factorization.

20211000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6868 counting only the distinct ones).

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

Adding to 20211000111 its reverse (11100011202), we get a palindrome (31311011313).

The spelling of 20211000111 in words is "twenty billion, two hundred eleven million, one hundred eleven", and thus it is an aban number.