21330010221 has 16 divisors (see below), whose sum is σ = 30639663936. Its totient is φ = 13121035776.

The previous prime is 21330010217. The next prime is 21330010259. The reversal of 21330010221 is 12201003312.

It is not a de Polignac number, because 21330010221 - 2² = 21330010217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330014221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4335 + ... + 206588.

It is an arithmetic number, because the mean of its divisors is an integer number (1914978996).

Almost surely, 2^21330010221 is an apocalyptic number.

It is an amenable number.

21330010221 is a deficient number, since it is larger than the sum of its proper divisors (9309653715).

21330010221 is a wasteful number, since it uses less digits than its factorization.

21330010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213532.

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

Adding to 21330010221 its reverse (12201003312), we get a palindrome (33531013533).

The spelling of 21330010221 in words is "twenty-one billion, three hundred thirty million, ten thousand, two hundred twenty-one".