7500553280021 has 2 divisors, whose sum is σ = 7500553280022. Its totient is φ = 7500553280020.

The previous prime is 7500553279997. The next prime is 7500553280069. The reversal of 7500553280021 is 1200823550057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4293552823921 + 3207000456100 = 2072089^2 + 1790810^2 .

It is a cyclic number.

It is not a de Polignac number, because 7500553280021 - 2²² = 7500549085717 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 (7500553280321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3750276640010 + 3750276640011.

It is an arithmetic number, because the mean of its divisors is an integer number (3750276640011).

Almost surely, 2^{7500553280021} is an apocalyptic number.

It is an amenable number.

7500553280021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7500553280021 is an equidigital number, since it uses as much as digits as its factorization.

7500553280021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 7500553280021 in words is "seven trillion, five hundred billion, five hundred fifty-three million, two hundred eighty thousand, twenty-one".