21100222203 has 4 divisors (see below), whose sum is σ = 28133629608. Its totient is φ = 14066814800.

The previous prime is 21100222189. The next prime is 21100222207. The reversal of 21100222203 is 30222200112.

It is a happy number.

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 21100222203 - 2²¹ = 21098125051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100222207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516703698 + ... + 3516703703.

It is an arithmetic number, because the mean of its divisors is an integer number (7033407402).

Almost surely, 2^21100222203 is an apocalyptic number.

21100222203 is a deficient number, since it is larger than the sum of its proper divisors (7033407405).

21100222203 is an equidigital number, since it uses as much as digits as its factorization.

21100222203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033407404.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21100222203 its reverse (30222200112), we get a palindrome (51322422315).

The spelling of 21100222203 in words is "twenty-one billion, one hundred million, two hundred twenty-two thousand, two hundred three".