4021330043421 has 12 divisors (see below), whose sum is σ = 5810891954140. Its totient is φ = 2679823258560.

The previous prime is 4021330043389. The next prime is 4021330043449. The reversal of 4021330043421 is 1243400331204.

4021330043421 is a `hidden beast` number, since 4 + 0 + 2 + 13 + 300 + 4 + 342 + 1 = 666.

4021330043421 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1276380252900 + 2744949790521 = 1129770^2 + 1656789^2 .

It is not a de Polignac number, because 4021330043421 - 2⁵ = 4021330043389 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 (4021330043221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88595806 + ... + 88641183.

Almost surely, 2^{4021330043421} is an apocalyptic number.

It is an amenable number.

4021330043421 is a deficient number, since it is larger than the sum of its proper divisors (1789561910719).

4021330043421 is a wasteful number, since it uses less digits than its factorization.

4021330043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177239516 (or 177239513 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 4021330043421 its reverse (1243400331204), we get a palindrome (5264730374625).

The spelling of 4021330043421 in words is "four trillion, twenty-one billion, three hundred thirty million, forty-three thousand, four hundred twenty-one".