21188004503 has 2 divisors, whose sum is σ = 21188004504. Its totient is φ = 21188004502.

The previous prime is 21188004499. The next prime is 21188004511. The reversal of 21188004503 is 30540088112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21188004503 - 2² = 21188004499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21188004503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21188004703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10594002251 + 10594002252.

It is an arithmetic number, because the mean of its divisors is an integer number (10594002252).

Almost surely, 2^21188004503 is an apocalyptic number.

21188004503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21188004503 is an equidigital number, since it uses as much as digits as its factorization.

21188004503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 21188004503 in words is "twenty-one billion, one hundred eighty-eight million, four thousand, five hundred three".