21301021002221 has 8 divisors (see below), whose sum is σ = 21796617152640. Its totient is φ = 20805435014112.

The previous prime is 21301021002187. The next prime is 21301021002227. The reversal of 21301021002221 is 12220012010312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301021002221 is a prime.

It is a Duffinian number.

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 21301021002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301021002227) 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, 1785041 + ... + 6766713.

It is an arithmetic number, because the mean of its divisors is an integer number (2724577144080).

Almost surely, 2^{21301021002221} is an apocalyptic number.

It is an amenable number.

21301021002221 is a deficient number, since it is larger than the sum of its proper divisors (495596150419).

21301021002221 is an equidigital number, since it uses as much as digits as its factorization.

21301021002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081155.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21301021002221 its reverse (12220012010312), we get a palindrome (33521033012533).

The spelling of 21301021002221 in words is "twenty-one trillion, three hundred one billion, twenty-one million, two thousand, two hundred twenty-one".