21221210110203 has 24 divisors (see below), whose sum is σ = 30704042191680. Its totient is φ = 14123863152000.

The previous prime is 21221210110193. The next prime is 21221210110211. The reversal of 21221210110203 is 30201101212212.

21221210110203 is a `hidden beast` number, since 21 + 221 + 210 + 1 + 10 + 203 = 666.

It is not a de Polignac number, because 21221210110203 - 2²¹ = 21221208013051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221210110223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19538725 + ... + 20596217.

It is an arithmetic number, because the mean of its divisors is an integer number (1279335091320).

Almost surely, 2^{21221210110203} is an apocalyptic number.

21221210110203 is a deficient number, since it is larger than the sum of its proper divisors (9482832081477).

21221210110203 is a wasteful number, since it uses less digits than its factorization.

21221210110203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061219 (or 1061216 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221210110203 its reverse (30201101212212), we get a palindrome (51422311322415).

The spelling of 21221210110203 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, one hundred ten thousand, two hundred three".