2021012222111 has 4 divisors (see below), whose sum is σ = 2021028843072. Its totient is φ = 2020995601152.

The previous prime is 2021012222077. The next prime is 2021012222143. The reversal of 2021012222111 is 1112222101202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021012222111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021012222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021012222161) 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, 8126735 + ... + 8371728.

It is an arithmetic number, because the mean of its divisors is an integer number (505257210768).

Almost surely, 2^{2021012222111} is an apocalyptic number.

2021012222111 is a deficient number, since it is larger than the sum of its proper divisors (16620961).

2021012222111 is a wasteful number, since it uses less digits than its factorization.

2021012222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16620960.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2021012222111 its reverse (1112222101202), we get a palindrome (3133234323313).

The spelling of 2021012222111 in words is "two trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, one hundred eleven".