2021102120111 has 4 divisors (see below), whose sum is σ = 2021180595672. Its totient is φ = 2021023644552.

The previous prime is 2021102120071. The next prime is 2021102120117. The reversal of 2021102120111 is 1110212011202.

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 2021102120111 - 2⁶ = 2021102120047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021102120117) 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, 39199136 + ... + 39250661.

It is an arithmetic number, because the mean of its divisors is an integer number (505295148918).

Almost surely, 2^{2021102120111} is an apocalyptic number.

2021102120111 is a deficient number, since it is larger than the sum of its proper divisors (78475561).

2021102120111 is an equidigital number, since it uses as much as digits as its factorization.

2021102120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78475560.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2021102120111 its reverse (1110212011202), we get a palindrome (3131314131313).

The spelling of 2021102120111 in words is "two trillion, twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred eleven".