21303858221 has 2 divisors, whose sum is σ = 21303858222. Its totient is φ = 21303858220.

The previous prime is 21303858203. The next prime is 21303858239. The reversal of 21303858221 is 12285830312.

It is a balanced prime because it is at equal distance from previous prime (21303858203) and next prime (21303858239).

It can be written as a sum of positive squares in only one way, i.e., 18549078025 + 2754780196 = 136195^2 + 52486^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303858221 - 2⁶ = 21303858157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303848221) 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 as a sum of consecutive naturals, namely, 10651929110 + 10651929111.

It is an arithmetic number, because the mean of its divisors is an integer number (10651929111).

Almost surely, 2^21303858221 is an apocalyptic number.

It is an amenable number.

21303858221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303858221 is an equidigital number, since it uses as much as digits as its factorization.

21303858221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21303858221 in words is "twenty-one billion, three hundred three million, eight hundred fifty-eight thousand, two hundred twenty-one".