38921572121 has 2 divisors, whose sum is σ = 38921572122. Its totient is φ = 38921572120.

The previous prime is 38921572091. The next prime is 38921572127. The reversal of 38921572121 is 12127512983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36429066496 + 2492505625 = 190864^2 + 49925^2 .

It is a cyclic number.

It is not a de Polignac number, because 38921572121 - 2⁶ = 38921572057 is a prime.

It is not a weakly prime, because it can be changed into another prime (38921572127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19460786060 + 19460786061.

It is an arithmetic number, because the mean of its divisors is an integer number (19460786061).

Almost surely, 2^38921572121 is an apocalyptic number.

It is an amenable number.

38921572121 is a deficient number, since it is larger than the sum of its proper divisors (1).

38921572121 is an equidigital number, since it uses as much as digits as its factorization.

38921572121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The spelling of 38921572121 in words is "thirty-eight billion, nine hundred twenty-one million, five hundred seventy-two thousand, one hundred twenty-one".