21242559375073 has 2 divisors, whose sum is σ = 21242559375074. Its totient is φ = 21242559375072.

The previous prime is 21242559375031. The next prime is 21242559375109. The reversal of 21242559375073 is 37057395524212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14854641805584 + 6387917569489 = 3854172^2 + 2527433^2 .

It is a cyclic number.

It is not a de Polignac number, because 21242559375073 - 2¹⁷ = 21242559244001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21242559375013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621279687536 + 10621279687537.

It is an arithmetic number, because the mean of its divisors is an integer number (10621279687537).

Almost surely, 2^{21242559375073} is an apocalyptic number.

It is an amenable number.

21242559375073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21242559375073 is an equidigital number, since it uses as much as digits as its factorization.

21242559375073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 21242559375073 in words is "twenty-one trillion, two hundred forty-two billion, five hundred fifty-nine million, three hundred seventy-five thousand, seventy-three".