21124530012073 has 2 divisors, whose sum is σ = 21124530012074. Its totient is φ = 21124530012072.

The previous prime is 21124530012043. The next prime is 21124530012133. The reversal of 21124530012073 is 37021003542112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17230111940889 + 3894418071184 = 4150917^2 + 1973428^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124530012073 - 2⁴¹ = 18925506756521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21124530012013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562265006036 + 10562265006037.

It is an arithmetic number, because the mean of its divisors is an integer number (10562265006037).

Almost surely, 2^{21124530012073} is an apocalyptic number.

It is an amenable number.

21124530012073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124530012073 is an equidigital number, since it uses as much as digits as its factorization.

21124530012073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 21124530012073 its reverse (37021003542112), we get a palindrome (58145533554185).

The spelling of 21124530012073 in words is "twenty-one trillion, one hundred twenty-four billion, five hundred thirty million, twelve thousand, seventy-three".