4021343021 has 2 divisors, whose sum is σ = 4021343022. Its totient is φ = 4021343020.

The previous prime is 4021342991. The next prime is 4021343057. The reversal of 4021343021 is 1203431204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3967614121 + 53728900 = 62989^2 + 7330^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021343021 - 2⁶ = 4021342957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021342984 and 4021343002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021349021) 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, 2010671510 + 2010671511.

It is an arithmetic number, because the mean of its divisors is an integer number (2010671511).

Almost surely, 2^4021343021 is an apocalyptic number.

It is an amenable number.

4021343021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021343021 is an equidigital number, since it uses as much as digits as its factorization.

4021343021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 4021343021 is about 63414.0601207650. The cubic root of 4021343021 is about 1590.2193731043.

Adding to 4021343021 its reverse (1203431204), we get a palindrome (5224774225).

The spelling of 4021343021 in words is "four billion, twenty-one million, three hundred forty-three thousand, twenty-one".