21302210012221 has 2 divisors, whose sum is σ = 21302210012222. Its totient is φ = 21302210012220.

The previous prime is 21302210012177. The next prime is 21302210012287. The reversal of 21302210012221 is 12221001220312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12011838956100 + 9290371056121 = 3465810^2 + 3048011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302210012221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302210012821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651105006110 + 10651105006111.

It is an arithmetic number, because the mean of its divisors is an integer number (10651105006111).

Almost surely, 2^{21302210012221} is an apocalyptic number.

It is an amenable number.

21302210012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302210012221 is an equidigital number, since it uses as much as digits as its factorization.

21302210012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21302210012221 its reverse (12221001220312), we get a palindrome (33523211232533).

The spelling of 21302210012221 in words is "twenty-one trillion, three hundred two billion, two hundred ten million, twelve thousand, two hundred twenty-one".