38315541221 has 2 divisors, whose sum is σ = 38315541222. Its totient is φ = 38315541220.

The previous prime is 38315541149. The next prime is 38315541259. The reversal of 38315541221 is 12214551383.

38315541221 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., 25166332321 + 13149208900 = 158639^2 + 114670^2 .

It is a cyclic number.

It is not a de Polignac number, because 38315541221 - 2²⁶ = 38248432357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38315571221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19157770610 + 19157770611.

It is an arithmetic number, because the mean of its divisors is an integer number (19157770611).

Almost surely, 2^38315541221 is an apocalyptic number.

It is an amenable number.

38315541221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38315541221 is an equidigital number, since it uses as much as digits as its factorization.

38315541221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The spelling of 38315541221 in words is "thirty-eight billion, three hundred fifteen million, five hundred forty-one thousand, two hundred twenty-one".