3011020021 has 4 divisors (see below), whose sum is σ = 3015316044. Its totient is φ = 3006724000.

The previous prime is 3011019997. The next prime is 3011020031. The reversal of 3011020021 is 1200201103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200201103 = 73 ⋅16441111.

It can be written as a sum of positive squares in 2 ways, for example, as 1721420100 + 1289599921 = 41490^2 + 35911^2 .

It is a cyclic number.

It is not a de Polignac number, because 3011020021 - 2¹⁵ = 3010987253 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 (3011020031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2146960 + ... + 2148361.

It is an arithmetic number, because the mean of its divisors is an integer number (753829011).

Almost surely, 2^3011020021 is an apocalyptic number.

It is an amenable number.

3011020021 is a deficient number, since it is larger than the sum of its proper divisors (4296023).

3011020021 is an equidigital number, since it uses as much as digits as its factorization.

3011020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296022.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 3011020021 is about 54872.7621047091. The cubic root of 3011020021 is about 1444.0133702271.

Adding to 3011020021 its reverse (1200201103), we get a palindrome (4211221124).

The spelling of 3011020021 in words is "three billion, eleven million, twenty thousand, twenty-one".