21221103211 has 48 divisors (see below), whose sum is σ = 28394098560. Its totient is φ = 15639765120.

The previous prime is 21221103143. The next prime is 21221103259. The reversal of 21221103211 is 11230112212.

It is not a de Polignac number, because 21221103211 - 2⁹ = 21221102699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221103271) 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 47 ways as a sum of consecutive naturals, for example, 8058351 + ... + 8060983.

It is an arithmetic number, because the mean of its divisors is an integer number (591543720).

Almost surely, 2^21221103211 is an apocalyptic number.

21221103211 is a deficient number, since it is larger than the sum of its proper divisors (7172995349).

21221103211 is a wasteful number, since it uses less digits than its factorization.

21221103211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464 (or 3457 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21221103211 its reverse (11230112212), we get a palindrome (32451215423).

Subtracting from 21221103211 its reverse (11230112212), we obtain a palindrome (9990990999).

The spelling of 21221103211 in words is "twenty-one billion, two hundred twenty-one million, one hundred three thousand, two hundred eleven".