21585032503 has 2 divisors, whose sum is σ = 21585032504. Its totient is φ = 21585032502.

The previous prime is 21585032477. The next prime is 21585032507. The reversal of 21585032503 is 30523058512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21585032503 - 2²⁹ = 21048161591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21585032507) 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, 10792516251 + 10792516252.

It is an arithmetic number, because the mean of its divisors is an integer number (10792516252).

Almost surely, 2^21585032503 is an apocalyptic number.

21585032503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21585032503 is an equidigital number, since it uses as much as digits as its factorization.

21585032503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 21585032503 in words is "twenty-one billion, five hundred eighty-five million, thirty-two thousand, five hundred three".