21110099903 has 2 divisors, whose sum is σ = 21110099904. Its totient is φ = 21110099902.

The previous prime is 21110099897. The next prime is 21110099909. The reversal of 21110099903 is 30999001112.

It is a balanced prime because it is at equal distance from previous prime (21110099897) and next prime (21110099909).

It is a cyclic number.

It is not a de Polignac number, because 21110099903 - 2¹² = 21110095807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110099909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555049951 + 10555049952.

It is an arithmetic number, because the mean of its divisors is an integer number (10555049952).

Almost surely, 2^21110099903 is an apocalyptic number.

21110099903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110099903 is an equidigital number, since it uses as much as digits as its factorization.

21110099903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The spelling of 21110099903 in words is "twenty-one billion, one hundred ten million, ninety-nine thousand, nine hundred three".