21330110221 has 8 divisors (see below), whose sum is σ = 24455153984. Its totient is φ = 18224537760.

The previous prime is 21330110173. The next prime is 21330110261. The reversal of 21330110221 is 12201103312.

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 21330110221 - 2¹⁵ = 21330077453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330110195 and 21330110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330110261) 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, 4865475 + ... + 4869856.

It is an arithmetic number, because the mean of its divisors is an integer number (3056894248).

Almost surely, 2^21330110221 is an apocalyptic number.

It is an amenable number.

21330110221 is a deficient number, since it is larger than the sum of its proper divisors (3125043763).

21330110221 is an equidigital number, since it uses as much as digits as its factorization.

21330110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9735651.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21330110221 its reverse (12201103312), we get a palindrome (33531213533).

The spelling of 21330110221 in words is "twenty-one billion, three hundred thirty million, one hundred ten thousand, two hundred twenty-one".