30312121321 has 2 divisors, whose sum is σ = 30312121322. Its totient is φ = 30312121320.

The previous prime is 30312121289. The next prime is 30312121331. The reversal of 30312121321 is 12312121303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29379674025 + 932447296 = 171405^2 + 30536^2 .

It is a cyclic number.

It is not a de Polignac number, because 30312121321 - 2⁵ = 30312121289 is a prime.

It is not a weakly prime, because it can be changed into another prime (30312121331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15156060660 + 15156060661.

It is an arithmetic number, because the mean of its divisors is an integer number (15156060661).

Almost surely, 2^30312121321 is an apocalyptic number.

It is an amenable number.

30312121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

30312121321 is an equidigital number, since it uses as much as digits as its factorization.

30312121321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 30312121321 its reverse (12312121303), we get a palindrome (42624242624).

The spelling of 30312121321 in words is "thirty billion, three hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".