21110102203 has 4 divisors (see below), whose sum is σ = 21131933680. Its totient is φ = 21088270728.

The previous prime is 21110102197. The next prime is 21110102227. The reversal of 21110102203 is 30220101112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110102203 - 2¹³ = 21110094011 is a prime.

It is a super-2 number, since 2×21110102203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110102303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10914288 + ... + 10916221.

It is an arithmetic number, because the mean of its divisors is an integer number (5282983420).

Almost surely, 2^21110102203 is an apocalyptic number.

21110102203 is a deficient number, since it is larger than the sum of its proper divisors (21831477).

21110102203 is an equidigital number, since it uses as much as digits as its factorization.

21110102203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21831476.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21110102203 its reverse (30220101112), we get a palindrome (51330203315).

The spelling of 21110102203 in words is "twenty-one billion, one hundred ten million, one hundred two thousand, two hundred three".