30218855021 has 2 divisors, whose sum is σ = 30218855022. Its totient is φ = 30218855020.

The previous prime is 30218855011. The next prime is 30218855047. The reversal of 30218855021 is 12055881203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24520114921 + 5698740100 = 156589^2 + 75490^2 .

It is a cyclic number.

It is not a de Polignac number, because 30218855021 - 2²² = 30214660717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30218855011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15109427510 + 15109427511.

It is an arithmetic number, because the mean of its divisors is an integer number (15109427511).

Almost surely, 2^30218855021 is an apocalyptic number.

It is an amenable number.

30218855021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30218855021 is an equidigital number, since it uses as much as digits as its factorization.

30218855021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 35.

The spelling of 30218855021 in words is "thirty billion, two hundred eighteen million, eight hundred fifty-five thousand, twenty-one".