21111112203 has 4 divisors (see below), whose sum is σ = 28148149608. Its totient is φ = 14074074800.

The previous prime is 21111112177. The next prime is 21111112207. The reversal of 21111112203 is 30221111112.

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 21111112203 - 2⁸ = 21111111947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111112207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518518698 + ... + 3518518703.

It is an arithmetic number, because the mean of its divisors is an integer number (7037037402).

Almost surely, 2^21111112203 is an apocalyptic number.

21111112203 is a deficient number, since it is larger than the sum of its proper divisors (7037037405).

21111112203 is an equidigital number, since it uses as much as digits as its factorization.

21111112203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037037404.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21111112203 its reverse (30221111112), we get a palindrome (51332223315).

The spelling of 21111112203 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred three".