20101000111 has 4 divisors (see below), whose sum is σ = 20102396832. Its totient is φ = 20099603392.

The previous prime is 20101000099. The next prime is 20101000159. The reversal of 20101000111 is 11100010102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20101000111 - 2¹³ = 20100991919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101000094 and 20101000103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101004111) 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, 676546 + ... + 705631.

It is an arithmetic number, because the mean of its divisors is an integer number (5025599208).

Almost surely, 2^20101000111 is an apocalyptic number.

20101000111 is a deficient number, since it is larger than the sum of its proper divisors (1396721).

20101000111 is a wasteful number, since it uses less digits than its factorization.

20101000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396720.

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

Adding to 20101000111 its reverse (11100010102), we get a palindrome (31201010213).

Subtracting from 20101000111 its reverse (11100010102), we obtain a palindrome (9000990009).

The spelling of 20101000111 in words is "twenty billion, one hundred one million, one hundred eleven", and thus it is an aban number.