2121110020111 has 4 divisors (see below), whose sum is σ = 2123294480424. Its totient is φ = 2118925559800.

The previous prime is 2121110020049. The next prime is 2121110020121. The reversal of 2121110020111 is 1110200111212.

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 2121110020111 - 2²⁷ = 2120975802383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121110020091 and 2121110020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121110020121) 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, 1092228700 + ... + 1092230641.

It is an arithmetic number, because the mean of its divisors is an integer number (530823620106).

Almost surely, 2^{2121110020111} is an apocalyptic number.

2121110020111 is a deficient number, since it is larger than the sum of its proper divisors (2184460313).

2121110020111 is an equidigital number, since it uses as much as digits as its factorization.

2121110020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184460312.

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

Adding to 2121110020111 its reverse (1110200111212), we get a palindrome (3231310131323).

The spelling of 2121110020111 in words is "two trillion, one hundred twenty-one billion, one hundred ten million, twenty thousand, one hundred eleven".