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2100100111 = 17312139307

2100100111 has 4 divisors (see below), whose sum is σ = 2112239592. Its totient is φ = 2087960632.

The previous prime is 2100100109. The next prime is 2100100127. The reversal of 2100100111 is 1110010012.

Adding to 2100100111 its reverse (1110010012), we get a palindrome (3210110123).

Subtracting from 2100100111 its reverse (1110010012), we obtain a palindrome (990090099).

It can be divided in two parts, 210010011 and 1, that added together give a palindrome (210010012).

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 2100100111 - 21 = 2100100109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100100094 and 2100100103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100100181) 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, 6069481 + ... + 6069826.

It is an arithmetic number, because the mean of its divisors is an integer number (528059898).

Almost surely, 22100100111 is an apocalyptic number.

2100100111 is a deficient number, since it is larger than the sum of its proper divisors (12139481).

2100100111 is a wasteful number, since it uses less digits than its factorization.

2100100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12139480.

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

The square root of 2100100111 is about 45826.8492371012. The cubic root of 2100100111 is about 1280.5995138801.

The spelling of 2100100111 in words is "two billion, one hundred million, one hundred thousand, one hundred eleven".

Divisors: 1 173 12139307 2100100111