21102102121203 has 48 divisors (see below), whose sum is σ = 31398130764000. Its totient is φ = 13651799284224.

The previous prime is 21102102121187. The next prime is 21102102121207. The reversal of 21102102121203 is 30212120120112.

21102102121203 is a `hidden beast` number, since 211 + 0 + 210 + 21 + 21 + 203 = 666.

It is not a de Polignac number, because 21102102121203 - 2⁴ = 21102102121187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102102121207) 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 47 ways as a sum of consecutive naturals, for example, 14891775 + ... + 16247127.

It is an arithmetic number, because the mean of its divisors is an integer number (654127724250).

Almost surely, 2^{21102102121203} is an apocalyptic number.

21102102121203 is a deficient number, since it is larger than the sum of its proper divisors (10296028642797).

21102102121203 is a wasteful number, since it uses less digits than its factorization.

21102102121203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355796 (or 1355793 counting only the distinct ones).

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

Adding to 21102102121203 its reverse (30212120120112), we get a palindrome (51314222241315).

The spelling of 21102102121203 in words is "twenty-one trillion, one hundred two billion, one hundred two million, one hundred twenty-one thousand, two hundred three".