21679502503 has 2 divisors, whose sum is σ = 21679502504. Its totient is φ = 21679502502.

The previous prime is 21679502497. The next prime is 21679502513. The reversal of 21679502503 is 30520597612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21679502503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21679502513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10839751251 + 10839751252.

It is an arithmetic number, because the mean of its divisors is an integer number (10839751252).

Almost surely, 2^21679502503 is an apocalyptic number.

21679502503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21679502503 is an equidigital number, since it uses as much as digits as its factorization.

21679502503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 21679502503 in words is "twenty-one billion, six hundred seventy-nine million, five hundred two thousand, five hundred three".