21211222203 has 48 divisors (see below), whose sum is σ = 31785770016. Its totient is φ = 13621063680.

The previous prime is 21211222189. The next prime is 21211222217. The reversal of 21211222203 is 30222211212.

It is an interprime number because it is at equal distance from previous prime (21211222189) and next prime (21211222217).

It is not a de Polignac number, because 21211222203 - 2¹⁰ = 21211221179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211222103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12800151 + ... + 12801807.

It is an arithmetic number, because the mean of its divisors is an integer number (662203542).

Almost surely, 2^21211222203 is an apocalyptic number.

21211222203 is a deficient number, since it is larger than the sum of its proper divisors (10574547813).

21211222203 is a wasteful number, since it uses less digits than its factorization.

21211222203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21211222203 its reverse (30222211212), we get a palindrome (51433433415).

The spelling of 21211222203 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred three".