38856273721 has 2 divisors, whose sum is σ = 38856273722. Its totient is φ = 38856273720.

The previous prime is 38856273719. The next prime is 38856273809. The reversal of 38856273721 is 12737265883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21007313721 + 17848960000 = 144939^2 + 133600^2 .

It is a cyclic number.

It is not a de Polignac number, because 38856273721 - 2¹ = 38856273719 is a prime.

Together with 38856273719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38856270721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19428136860 + 19428136861.

It is an arithmetic number, because the mean of its divisors is an integer number (19428136861).

Almost surely, 2^38856273721 is an apocalyptic number.

It is an amenable number.

38856273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

38856273721 is an equidigital number, since it uses as much as digits as its factorization.

38856273721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 52.

The spelling of 38856273721 in words is "thirty-eight billion, eight hundred fifty-six million, two hundred seventy-three thousand, seven hundred twenty-one".