4000343021 has 2 divisors, whose sum is σ = 4000343022. Its totient is φ = 4000343020.

The previous prime is 4000342999. The next prime is 4000343029. The reversal of 4000343021 is 1203430004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3752910121 + 247432900 = 61261^2 + 15730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000343021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000343029) 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, 2000171510 + 2000171511.

It is an arithmetic number, because the mean of its divisors is an integer number (2000171511).

Almost surely, 2^4000343021 is an apocalyptic number.

It is an amenable number.

4000343021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000343021 is an equidigital number, since it uses as much as digits as its factorization.

4000343021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 4000343021 is about 63248.2649643451. The cubic root of 4000343021 is about 1587.4464266625.

Adding to 4000343021 its reverse (1203430004), we get a palindrome (5203773025).

The spelling of 4000343021 in words is "four billion, three hundred forty-three thousand, twenty-one".