7042036021 has 16 divisors (see below), whose sum is σ = 7501829040. Its totient is φ = 6587412480.

The previous prime is 7042036019. The next prime is 7042036049. The reversal of 7042036021 is 1206302407.

It can be written as a sum of positive squares in 8 ways, for example, as 980100 + 7041055921 = 990^2 + 83911^2 .

It is a cyclic number.

It is not a de Polignac number, because 7042036021 - 2¹ = 7042036019 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 (7042036061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2961385 + ... + 2963761.

It is an arithmetic number, because the mean of its divisors is an integer number (468864315).

Almost surely, 2^7042036021 is an apocalyptic number.

It is an amenable number.

7042036021 is a deficient number, since it is larger than the sum of its proper divisors (459793019).

7042036021 is a wasteful number, since it uses less digits than its factorization.

7042036021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 7042036021 is about 83916.8399130949. The cubic root of 7042036021 is about 1916.7526869757.

Adding to 7042036021 its reverse (1206302407), we get a palindrome (8248338428).

The spelling of 7042036021 in words is "seven billion, forty-two million, thirty-six thousand, twenty-one".