4038845221 has 2 divisors, whose sum is σ = 4038845222. Its totient is φ = 4038845220.

The previous prime is 4038845201. The next prime is 4038845303. The reversal of 4038845221 is 1225488304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2175196321 + 1863648900 = 46639^2 + 43170^2 .

It is a cyclic number.

It is not a de Polignac number, because 4038845221 - 2¹¹ = 4038843173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4038845201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2019422610 + 2019422611.

It is an arithmetic number, because the mean of its divisors is an integer number (2019422611).

Almost surely, 2^4038845221 is an apocalyptic number.

It is an amenable number.

4038845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4038845221 is an equidigital number, since it uses as much as digits as its factorization.

4038845221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 4038845221 is about 63551.9096565949. The cubic root of 4038845221 is about 1592.5230857562.

The spelling of 4038845221 in words is "four billion, thirty-eight million, eight hundred forty-five thousand, two hundred twenty-one".