30123220321 has 2 divisors, whose sum is σ = 30123220322. Its totient is φ = 30123220320.

The previous prime is 30123220319. The next prime is 30123220333. The reversal of 30123220321 is 12302232103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26670482721 + 3452737600 = 163311^2 + 58760^2 .

It is a cyclic number.

It is not a de Polignac number, because 30123220321 - 2¹ = 30123220319 is a prime.

Together with 30123220319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30123220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15061610160 + 15061610161.

It is an arithmetic number, because the mean of its divisors is an integer number (15061610161).

Almost surely, 2^30123220321 is an apocalyptic number.

It is an amenable number.

30123220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

30123220321 is an equidigital number, since it uses as much as digits as its factorization.

30123220321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 30123220321 its reverse (12302232103), we get a palindrome (42425452424).

The spelling of 30123220321 in words is "thirty billion, one hundred twenty-three million, two hundred twenty thousand, three hundred twenty-one".