2121021100111 has 4 divisors (see below), whose sum is σ = 2166149208672. Its totient is φ = 2075892991552.

The previous prime is 2121021100087. The next prime is 2121021100151. The reversal of 2121021100111 is 1110011201212.

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 2121021100111 - 2¹⁵ = 2121021067343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121021100091 and 2121021100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121021100151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22564054210 + ... + 22564054303.

It is an arithmetic number, because the mean of its divisors is an integer number (541537302168).

Almost surely, 2^{2121021100111} is an apocalyptic number.

2121021100111 is a deficient number, since it is larger than the sum of its proper divisors (45128108561).

2121021100111 is an equidigital number, since it uses as much as digits as its factorization.

2121021100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45128108560.

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

Adding to 2121021100111 its reverse (1110011201212), we get a palindrome (3231032301323).

The spelling of 2121021100111 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, one hundred eleven".