20100001111 has 4 divisors (see below), whose sum is σ = 20212291800. Its totient is φ = 19987710424.

The previous prime is 20100001087. The next prime is 20100001121. The reversal of 20100001111 is 11110000102.

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 20100001111 - 2¹⁹ = 20099476823 is a prime.

It is a Duffinian number.

20100001111 is a modest number, since divided by 1111 gives 201 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20100001094 and 20100001103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100001121) 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 3 ways as a sum of consecutive naturals, for example, 56145076 + ... + 56145433.

It is an arithmetic number, because the mean of its divisors is an integer number (5053072950).

Almost surely, 2^20100001111 is an apocalyptic number.

20100001111 is a deficient number, since it is larger than the sum of its proper divisors (112290689).

20100001111 is a wasteful number, since it uses less digits than its factorization.

20100001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112290688.

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

Adding to 20100001111 its reverse (11110000102), we get a palindrome (31210001213).

The spelling of 20100001111 in words is "twenty billion, one hundred million, one thousand, one hundred eleven".