21188936903 has 2 divisors, whose sum is σ = 21188936904. Its totient is φ = 21188936902.

The previous prime is 21188936897. The next prime is 21188936917. The reversal of 21188936903 is 30963988112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21188936903 - 2⁴ = 21188936887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21188936983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10594468451 + 10594468452.

It is an arithmetic number, because the mean of its divisors is an integer number (10594468452).

Almost surely, 2^21188936903 is an apocalyptic number.

21188936903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21188936903 is an equidigital number, since it uses as much as digits as its factorization.

21188936903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 21188936903 in words is "twenty-one billion, one hundred eighty-eight million, nine hundred thirty-six thousand, nine hundred three".