2820021111 has 12 divisors (see below), whose sum is σ = 4080505000. Its totient is φ = 1876718160.

The previous prime is 2820021091. The next prime is 2820021121. The reversal of 2820021111 is 1111200282.

2820021111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2820021111 - 2⁵ = 2820021079 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 (2820021121) 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, 269236 + ... + 279513.

Almost surely, 2^2820021111 is an apocalyptic number.

2820021111 is a deficient number, since it is larger than the sum of its proper divisors (1260483889).

2820021111 is a wasteful number, since it uses less digits than its factorization.

2820021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549326 (or 549323 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 2820021111 is about 53103.8709605995. The cubic root of 2820021111 is about 1412.8111698715.

Adding to 2820021111 its reverse (1111200282), we get a palindrome (3931221393).

The spelling of 2820021111 in words is "two billion, eight hundred twenty million, twenty-one thousand, one hundred eleven".