2021021212111 has 12 divisors (see below), whose sum is σ = 2226795879672. Its totient is φ = 1819100900000.

The previous prime is 2021021212099. The next prime is 2021021212159. The reversal of 2021021212111 is 1112121201202.

It is not a de Polignac number, because 2021021212111 - 2¹⁹ = 2021020687823 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 (2021021212711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8893240 + ... + 9117661.

It is an arithmetic number, because the mean of its divisors is an integer number (185566323306).

Almost surely, 2^{2021021212111} is an apocalyptic number.

2021021212111 is a deficient number, since it is larger than the sum of its proper divisors (205774667561).

2021021212111 is a wasteful number, since it uses less digits than its factorization.

2021021212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18011114 (or 18011013 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2021021212111 its reverse (1112121201202), we get a palindrome (3133142413313).

The spelling of 2021021212111 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twelve thousand, one hundred eleven".