21330100221 has 8 divisors (see below), whose sum is σ = 28604528160. Its totient is φ = 14137869552.

The previous prime is 21330100199. The next prime is 21330100223. The reversal of 21330100221 is 12200103312.

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

It is not a de Polignac number, because 21330100221 - 2⁹ = 21330099709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21330100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330100223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20548711 + ... + 20549748.

It is an arithmetic number, because the mean of its divisors is an integer number (3575566020).

Almost surely, 2^21330100221 is an apocalyptic number.

It is an amenable number.

21330100221 is a deficient number, since it is larger than the sum of its proper divisors (7274427939).

21330100221 is a wasteful number, since it uses less digits than its factorization.

21330100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41098635.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21330100221 its reverse (12200103312), we get a palindrome (33530203533).

The spelling of 21330100221 in words is "twenty-one billion, three hundred thirty million, one hundred thousand, two hundred twenty-one".