4086842021 has 2 divisors, whose sum is σ = 4086842022. Its totient is φ = 4086842020.

The previous prime is 4086842017. The next prime is 4086842033. The reversal of 4086842021 is 1202486804.

4086842021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2276339521 + 1810502500 = 47711^2 + 42550^2 .

It is a cyclic number.

It is not a de Polignac number, because 4086842021 - 2² = 4086842017 is a prime.

It is a super-2 number, since 2×4086842021² = 33404555409222728882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4086842821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2043421010 + 2043421011.

It is an arithmetic number, because the mean of its divisors is an integer number (2043421011).

Almost surely, 2^4086842021 is an apocalyptic number.

It is an amenable number.

4086842021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4086842021 is an equidigital number, since it uses as much as digits as its factorization.

4086842021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 4086842021 is about 63928.4132526375. The cubic root of 4086842021 is about 1598.8066650087.

The spelling of 4086842021 in words is "four billion, eighty-six million, eight hundred forty-two thousand, twenty-one".