4678216021 has 2 divisors, whose sum is σ = 4678216022. Its totient is φ = 4678216020.

The previous prime is 4678215961. The next prime is 4678216033. The reversal of 4678216021 is 1206128764.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4154447025 + 523768996 = 64455^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 4678216021 - 2¹³ = 4678207829 is a prime.

It is a super-3 number, since 3×4678216021³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4678216051) 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 as a sum of consecutive naturals, namely, 2339108010 + 2339108011.

It is an arithmetic number, because the mean of its divisors is an integer number (2339108011).

Almost surely, 2^4678216021 is an apocalyptic number.

It is an amenable number.

4678216021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4678216021 is an equidigital number, since it uses as much as digits as its factorization.

4678216021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 4678216021 is about 68397.4854874066. The cubic root of 4678216021 is about 1672.4767558137.

The spelling of 4678216021 in words is "four billion, six hundred seventy-eight million, two hundred sixteen thousand, twenty-one".