2021220122111 has 16 divisors (see below), whose sum is σ = 2036581747200. Its totient is φ = 2005904080128.

The previous prime is 2021220122101. The next prime is 2021220122137. The reversal of 2021220122111 is 1112210221202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021220122111 is a prime.

It is a super-3 number, since 3×2021220122111³ (a number of 38 digits) contains 333 as substring.

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 2021220122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021220122101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300818210 + ... + 300824928.

It is an arithmetic number, because the mean of its divisors is an integer number (127286359200).

Almost surely, 2^{2021220122111} is an apocalyptic number.

2021220122111 is a deficient number, since it is larger than the sum of its proper divisors (15361625089).

2021220122111 is a wasteful number, since it uses less digits than its factorization.

2021220122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778.

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

Adding to 2021220122111 its reverse (1112210221202), we get a palindrome (3133430343313).

Subtracting from 2021220122111 its reverse (1112210221202), we obtain a palindrome (909009900909).

The spelling of 2021220122111 in words is "two trillion, twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred eleven".