306021120221 has 2 divisors, whose sum is σ = 306021120222. Its totient is φ = 306021120220.

The previous prime is 306021120203. The next prime is 306021120299. The reversal of 306021120221 is 122021120603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234245352121 + 71775768100 = 483989^2 + 267910^2 .

It is a cyclic number.

It is not a de Polignac number, because 306021120221 - 2¹⁴ = 306021103837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 306021120193 and 306021120202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306021120521) 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, 153010560110 + 153010560111.

It is an arithmetic number, because the mean of its divisors is an integer number (153010560111).

Almost surely, 2^306021120221 is an apocalyptic number.

It is an amenable number.

306021120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

306021120221 is an equidigital number, since it uses as much as digits as its factorization.

306021120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 306021120221 its reverse (122021120603), we get a palindrome (428042240824).

The spelling of 306021120221 in words is "three hundred six billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".