21239054503 has 2 divisors, whose sum is σ = 21239054504. Its totient is φ = 21239054502.

The previous prime is 21239054387. The next prime is 21239054549. The reversal of 21239054503 is 30545093212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21239054503 - 2²⁹ = 20702183591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21239054303) 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, 10619527251 + 10619527252.

It is an arithmetic number, because the mean of its divisors is an integer number (10619527252).

Almost surely, 2^21239054503 is an apocalyptic number.

21239054503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21239054503 is an equidigital number, since it uses as much as digits as its factorization.

21239054503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 21239054503 in words is "twenty-one billion, two hundred thirty-nine million, fifty-four thousand, five hundred three".