21115323152057 has 2 divisors, whose sum is σ = 21115323152058. Its totient is φ = 21115323152056.

The previous prime is 21115323152029. The next prime is 21115323152081. The reversal of 21115323152057 is 75025132351112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20840512349881 + 274810802176 = 4565141^2 + 524224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21115323152057 - 2¹⁰ = 21115323151033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21115323152057.

It is not a weakly prime, because it can be changed into another prime (21115323152017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557661576028 + 10557661576029.

It is an arithmetic number, because the mean of its divisors is an integer number (10557661576029).

Almost surely, 2^{21115323152057} is an apocalyptic number.

It is an amenable number.

21115323152057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115323152057 is an equidigital number, since it uses as much as digits as its factorization.

21115323152057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 21115323152057 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-three million, one hundred fifty-two thousand, fifty-seven".