38543568221 has 2 divisors, whose sum is σ = 38543568222. Its totient is φ = 38543568220.

The previous prime is 38543568191. The next prime is 38543568229. The reversal of 38543568221 is 12286534583.

38543568221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28937412100 + 9606156121 = 170110^2 + 98011^2 .

It is a cyclic number.

It is not a de Polignac number, because 38543568221 - 2³⁴ = 21363699037 is a prime.

It is a super-2 number, since 2×38543568221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38543568229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19271784110 + 19271784111.

It is an arithmetic number, because the mean of its divisors is an integer number (19271784111).

Almost surely, 2^38543568221 is an apocalyptic number.

It is an amenable number.

38543568221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38543568221 is an equidigital number, since it uses as much as digits as its factorization.

38543568221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 47.

The spelling of 38543568221 in words is "thirty-eight billion, five hundred forty-three million, five hundred sixty-eight thousand, two hundred twenty-one".