2021011220111 has 32 divisors (see below), whose sum is σ = 2217021683520. Its totient is φ = 1831064361984.

The previous prime is 2021011220071. The next prime is 2021011220141. The reversal of 2021011220111 is 1110221101202.

It is a de Polignac number, because none of the positive numbers 2^k-2021011220111 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 (2021011220141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166895525 + ... + 166907633.

It is an arithmetic number, because the mean of its divisors is an integer number (69281927610).

Almost surely, 2^{2021011220111} is an apocalyptic number.

2021011220111 is a deficient number, since it is larger than the sum of its proper divisors (196010463409).

2021011220111 is a wasteful number, since it uses less digits than its factorization.

2021011220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13035.

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

Adding to 2021011220111 its reverse (1110221101202), we get a palindrome (3131232321313).

The spelling of 2021011220111 in words is "two trillion, twenty-one billion, eleven million, two hundred twenty thousand, one hundred eleven".