38781171421 has 2 divisors, whose sum is σ = 38781171422. Its totient is φ = 38781171420.

The previous prime is 38781171397. The next prime is 38781171509. The reversal of 38781171421 is 12417118783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30550145796 + 8231025625 = 174786^2 + 90725^2 .

It is a cyclic number.

It is not a de Polignac number, because 38781171421 - 2¹⁵ = 38781138653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38781171521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390585710 + 19390585711.

It is an arithmetic number, because the mean of its divisors is an integer number (19390585711).

Almost surely, 2^38781171421 is an apocalyptic number.

It is an amenable number.

38781171421 is a deficient number, since it is larger than the sum of its proper divisors (1).

38781171421 is an equidigital number, since it uses as much as digits as its factorization.

38781171421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 43.

The spelling of 38781171421 in words is "thirty-eight billion, seven hundred eighty-one million, one hundred seventy-one thousand, four hundred twenty-one".