21100030221 has 8 divisors (see below), whose sum is σ = 29103490080. Its totient is φ = 13581628592.

The previous prime is 21100030207. The next prime is 21100030243. The reversal of 21100030221 is 12203000112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100030221 - 2⁷ = 21100030093 is a prime.

It is a super-2 number, since 2×21100030221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100030197 and 21100030206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100030201) 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 7 ways as a sum of consecutive naturals, for example, 121264455 + ... + 121264628.

It is an arithmetic number, because the mean of its divisors is an integer number (3637936260).

Almost surely, 2^21100030221 is an apocalyptic number.

It is an amenable number.

21100030221 is a deficient number, since it is larger than the sum of its proper divisors (8003459859).

21100030221 is a wasteful number, since it uses less digits than its factorization.

21100030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242529115.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21100030221 its reverse (12203000112), we get a palindrome (33303030333).

The spelling of 21100030221 in words is "twenty-one billion, one hundred million, thirty thousand, two hundred twenty-one".