21302434420221 has 16 divisors (see below), whose sum is σ = 29943939464640. Its totient is φ = 13433565456000.

The previous prime is 21302434420207. The next prime is 21302434420231. The reversal of 21302434420221 is 12202443420312.

It is not a de Polignac number, because 21302434420221 - 2¹⁹ = 21302433895933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302434420231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286124280 + ... + 286198721.

It is an arithmetic number, because the mean of its divisors is an integer number (1871496216540).

Almost surely, 2^{21302434420221} is an apocalyptic number.

It is an amenable number.

21302434420221 is a deficient number, since it is larger than the sum of its proper divisors (8641505044419).

21302434420221 is a wasteful number, since it uses less digits than its factorization.

21302434420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572323676.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21302434420221 its reverse (12202443420312), we get a palindrome (33504877840533).

Subtracting from 21302434420221 its reverse (12202443420312), we obtain a palindrome (9099990999909).

The spelling of 21302434420221 in words is "twenty-one trillion, three hundred two billion, four hundred thirty-four million, four hundred twenty thousand, two hundred twenty-one".