21210112203 has 32 divisors (see below), whose sum is σ = 34284925440. Its totient is φ = 11385930240.

The previous prime is 21210112199. The next prime is 21210112223. The reversal of 21210112203 is 30221101212.

It is not a de Polignac number, because 21210112203 - 2² = 21210112199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210112223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138228 + ... + 248046.

It is an arithmetic number, because the mean of its divisors is an integer number (1071403920).

Almost surely, 2^21210112203 is an apocalyptic number.

21210112203 is a deficient number, since it is larger than the sum of its proper divisors (13074813237).

21210112203 is a wasteful number, since it uses less digits than its factorization.

21210112203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110387.

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

Adding to 21210112203 its reverse (30221101212), we get a palindrome (51431213415).

The spelling of 21210112203 in words is "twenty-one billion, two hundred ten million, one hundred twelve thousand, two hundred three".