20011102111 has 24 divisors (see below), whose sum is σ = 27347849424. Its totient is φ = 14393594880.

The previous prime is 20011102109. The next prime is 20011102127. The reversal of 20011102111 is 11120111002.

It is not a de Polignac number, because 20011102111 - 2¹ = 20011102109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011102171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1420930 + ... + 1434943.

It is an arithmetic number, because the mean of its divisors is an integer number (1139493726).

Almost surely, 2^20011102111 is an apocalyptic number.

20011102111 is a deficient number, since it is larger than the sum of its proper divisors (7336747313).

20011102111 is a wasteful number, since it uses less digits than its factorization.

20011102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855911 (or 2855904 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20011102111 its reverse (11120111002), we get a palindrome (31131213113).

The spelling of 20011102111 in words is "twenty billion, eleven million, one hundred two thousand, one hundred eleven".