20112001111 has 4 divisors (see below), whose sum is σ = 20122165800. Its totient is φ = 20101836424.

The previous prime is 20112001097. The next prime is 20112001121. The reversal of 20112001111 is 11110021102.

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 20112001111 - 2⁷ = 20112000983 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 (20112001121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5079376 + ... + 5083333.

It is an arithmetic number, because the mean of its divisors is an integer number (5030541450).

Almost surely, 2^20112001111 is an apocalyptic number.

20112001111 is a deficient number, since it is larger than the sum of its proper divisors (10164689).

20112001111 is a wasteful number, since it uses less digits than its factorization.

20112001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10164688.

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

Adding to 20112001111 its reverse (11110021102), we get a palindrome (31222022213).

The spelling of 20112001111 in words is "twenty billion, one hundred twelve million, one thousand, one hundred eleven".