2102121100111 has 4 divisors (see below), whose sum is σ = 2102174695224. Its totient is φ = 2102067505000.

The previous prime is 2102121100049. The next prime is 2102121100117. The reversal of 2102121100111 is 1110011212012.

It is a happy number.

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 2102121100111 - 2³¹ = 2099973616463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102121100091 and 2102121100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102121100117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26738680 + ... + 26817181.

It is an arithmetic number, because the mean of its divisors is an integer number (525543673806).

Almost surely, 2^{2102121100111} is an apocalyptic number.

2102121100111 is a deficient number, since it is larger than the sum of its proper divisors (53595113).

2102121100111 is an equidigital number, since it uses as much as digits as its factorization.

2102121100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53595112.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2102121100111 its reverse (1110011212012), we get a palindrome (3212132312123).

The spelling of 2102121100111 in words is "two trillion, one hundred two billion, one hundred twenty-one million, one hundred thousand, one hundred eleven".