21185458103 has 2 divisors, whose sum is σ = 21185458104. Its totient is φ = 21185458102.

The previous prime is 21185458087. The next prime is 21185458117. The reversal of 21185458103 is 30185458112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21185458103 - 2⁴ = 21185458087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21185458153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592729051 + 10592729052.

It is an arithmetic number, because the mean of its divisors is an integer number (10592729052).

Almost surely, 2^21185458103 is an apocalyptic number.

21185458103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21185458103 is an equidigital number, since it uses as much as digits as its factorization.

21185458103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 38.

Subtracting 21185458103 from its reverse (30185458112), we obtain a palindrome (9000000009).

The spelling of 21185458103 in words is "twenty-one billion, one hundred eighty-five million, four hundred fifty-eight thousand, one hundred three".