21857838103 has 2 divisors, whose sum is σ = 21857838104. Its totient is φ = 21857838102.

The previous prime is 21857838073. The next prime is 21857838161. The reversal of 21857838103 is 30183875812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21857838103 - 2⁹ = 21857837591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21857838503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10928919051 + 10928919052.

It is an arithmetic number, because the mean of its divisors is an integer number (10928919052).

Almost surely, 2^21857838103 is an apocalyptic number.

21857838103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21857838103 is an equidigital number, since it uses as much as digits as its factorization.

21857838103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 21857838103 in words is "twenty-one billion, eight hundred fifty-seven million, eight hundred thirty-eight thousand, one hundred three".