21111022203 has 16 divisors (see below), whose sum is σ = 28287651840. Its totient is φ = 14004264384.

The previous prime is 21111022193. The next prime is 21111022217. The reversal of 21111022203 is 30222011112.

It is not a de Polignac number, because 21111022203 - 2⁴ = 21111022187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111022223) 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 15 ways as a sum of consecutive naturals, for example, 1695063 + ... + 1707471.

It is an arithmetic number, because the mean of its divisors is an integer number (1767978240).

Almost surely, 2^21111022203 is an apocalyptic number.

21111022203 is a deficient number, since it is larger than the sum of its proper divisors (7176629637).

21111022203 is a wasteful number, since it uses less digits than its factorization.

21111022203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15178.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21111022203 its reverse (30222011112), we get a palindrome (51333033315).

The spelling of 21111022203 in words is "twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred three".