21331102221 has 240 divisors, whose sum is σ = 40878794880. Its totient is φ = 10977120000.

The previous prime is 21331102187. The next prime is 21331102259. The reversal of 21331102221 is 12220113312.

It is not a de Polignac number, because 21331102221 - 2¹⁴ = 21331085837 is a prime.

It is a super-2 number, since 2×21331102221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21331102194 and 21331102203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331102721) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 84984346 + ... + 84984596.

It is an arithmetic number, because the mean of its divisors is an integer number (170328312).

Almost surely, 2^21331102221 is an apocalyptic number.

It is an amenable number.

21331102221 is a deficient number, since it is larger than the sum of its proper divisors (19547692659).

21331102221 is a wasteful number, since it uses less digits than its factorization.

21331102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21331102221 its reverse (12220113312), we get a palindrome (33551215533).

The spelling of 21331102221 in words is "twenty-one billion, three hundred thirty-one million, one hundred two thousand, two hundred twenty-one".