51573536428021 has 2 divisors, whose sum is σ = 51573536428022. Its totient is φ = 51573536428020.

The previous prime is 51573536427983. The next prime is 51573536428039. The reversal of 51573536428021 is 12082463537515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36315255173796 + 15258281254225 = 6026214^2 + 3906185^2 .

It is a cyclic number.

It is not a de Polignac number, because 51573536428021 - 2²⁹ = 51572999557109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51573536428021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51573536428061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25786768214010 + 25786768214011.

It is an arithmetic number, because the mean of its divisors is an integer number (25786768214011).

Almost surely, 2^{51573536428021} is an apocalyptic number.

It is an amenable number.

51573536428021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51573536428021 is an equidigital number, since it uses as much as digits as its factorization.

51573536428021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 51573536428021 in words is "fifty-one trillion, five hundred seventy-three billion, five hundred thirty-six million, four hundred twenty-eight thousand, twenty-one".