38145860821 has 2 divisors, whose sum is σ = 38145860822. Its totient is φ = 38145860820.

The previous prime is 38145860749. The next prime is 38145860827. The reversal of 38145860821 is 12806854183.

38145860821 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., 33750833796 + 4395027025 = 183714^2 + 66295^2 .

It is a cyclic number.

It is not a de Polignac number, because 38145860821 - 2⁹ = 38145860309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38145860827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19072930410 + 19072930411.

It is an arithmetic number, because the mean of its divisors is an integer number (19072930411).

Almost surely, 2^38145860821 is an apocalyptic number.

It is an amenable number.

38145860821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38145860821 is an equidigital number, since it uses as much as digits as its factorization.

38145860821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 38145860821 in words is "thirty-eight billion, one hundred forty-five million, eight hundred sixty thousand, eight hundred twenty-one".