38354647921 has 2 divisors, whose sum is σ = 38354647922. Its totient is φ = 38354647920.

The previous prime is 38354647907. The next prime is 38354647931. The reversal of 38354647921 is 12974645383.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32119808400 + 6234839521 = 179220^2 + 78961^2 .

It is a cyclic number.

It is not a de Polignac number, because 38354647921 - 2¹¹ = 38354645873 is a prime.

It is not a weakly prime, because it can be changed into another prime (38354647931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19177323960 + 19177323961.

It is an arithmetic number, because the mean of its divisors is an integer number (19177323961).

Almost surely, 2^38354647921 is an apocalyptic number.

It is an amenable number.

38354647921 is a deficient number, since it is larger than the sum of its proper divisors (1).

38354647921 is an equidigital number, since it uses as much as digits as its factorization.

38354647921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 52.

The spelling of 38354647921 in words is "thirty-eight billion, three hundred fifty-four million, six hundred forty-seven thousand, nine hundred twenty-one".