20010112111 has 4 divisors (see below), whose sum is σ = 21829213224. Its totient is φ = 18191011000.

The previous prime is 20010112103. The next prime is 20010112127. The reversal of 20010112111 is 11121101002.

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 20010112111 - 2³ = 20010112103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20610112111) 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, 909550540 + ... + 909550561.

It is an arithmetic number, because the mean of its divisors is an integer number (5457303306).

Almost surely, 2^20010112111 is an apocalyptic number.

20010112111 is a deficient number, since it is larger than the sum of its proper divisors (1819101113).

20010112111 is a wasteful number, since it uses less digits than its factorization.

20010112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819101112.

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

Adding to 20010112111 its reverse (11121101002), we get a palindrome (31131213113).

It can be divided in two parts, 200101 and 12111, that added together give a palindrome (212212).

The spelling of 20010112111 in words is "twenty billion, ten million, one hundred twelve thousand, one hundred eleven".