2101123111 has 8 divisors (see below), whose sum is σ = 2123906960. Its totient is φ = 2078362368.

The previous prime is 2101123081. The next prime is 2101123121. The reversal of 2101123111 is 1113211012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101123111 - 2¹¹ = 2101121063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101123091 and 2101123100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101123121) 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 7 ways as a sum of consecutive naturals, for example, 227200 + ... + 236266.

It is an arithmetic number, because the mean of its divisors is an integer number (265488370).

Almost surely, 2^2101123111 is an apocalyptic number.

2101123111 is a deficient number, since it is larger than the sum of its proper divisors (22783849).

2101123111 is an equidigital number, since it uses as much as digits as its factorization.

2101123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11553.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2101123111 is about 45838.0094572179. The cubic root of 2101123111 is about 1280.8074151822.

Adding to 2101123111 its reverse (1113211012), we get a palindrome (3214334123).

The spelling of 2101123111 in words is "two billion, one hundred one million, one hundred twenty-three thousand, one hundred eleven".