75057921917021 has 2 divisors, whose sum is σ = 75057921917022. Its totient is φ = 75057921917020.

The previous prime is 75057921916987. The next prime is 75057921917101. The reversal of 75057921917021 is 12071912975057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47705074216996 + 27352847700025 = 6906886^2 + 5229995^2 .

It is a cyclic number.

It is not a de Polignac number, because 75057921917021 - 2¹⁰ = 75057921915997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75057921917521) 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, 37528960958510 + 37528960958511.

It is an arithmetic number, because the mean of its divisors is an integer number (37528960958511).

Almost surely, 2^{75057921917021} is an apocalyptic number.

It is an amenable number.

75057921917021 is a deficient number, since it is larger than the sum of its proper divisors (1).

75057921917021 is an equidigital number, since it uses as much as digits as its factorization.

75057921917021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2778300, while the sum is 56.

The spelling of 75057921917021 in words is "seventy-five trillion, fifty-seven billion, nine hundred twenty-one million, nine hundred seventeen thousand, twenty-one".