21513342456503 has 2 divisors, whose sum is σ = 21513342456504. Its totient is φ = 21513342456502.

The previous prime is 21513342456491. The next prime is 21513342456509. The reversal of 21513342456503 is 30565424331512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21513342456503 - 2²⁶ = 21513275347639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21513342456509) 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, 10756671228251 + 10756671228252.

It is an arithmetic number, because the mean of its divisors is an integer number (10756671228252).

Almost surely, 2^{21513342456503} is an apocalyptic number.

21513342456503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21513342456503 is an equidigital number, since it uses as much as digits as its factorization.

21513342456503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 21513342456503 in words is "twenty-one trillion, five hundred thirteen billion, three hundred forty-two million, four hundred fifty-six thousand, five hundred three".