21037500503 has 2 divisors, whose sum is σ = 21037500504. Its totient is φ = 21037500502.

The previous prime is 21037500469. The next prime is 21037500559. The reversal of 21037500503 is 30500573012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21037500503 - 2⁶ = 21037500439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21037500563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518750251 + 10518750252.

It is an arithmetic number, because the mean of its divisors is an integer number (10518750252).

Almost surely, 2^21037500503 is an apocalyptic number.

21037500503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21037500503 is an equidigital number, since it uses as much as digits as its factorization.

21037500503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 26.

The spelling of 21037500503 in words is "twenty-one billion, thirty-seven million, five hundred thousand, five hundred three".