20121230321 has 2 divisors, whose sum is σ = 20121230322. Its totient is φ = 20121230320.

The previous prime is 20121230317. The next prime is 20121230351. The reversal of 20121230321 is 12303212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14027086096 + 6094144225 = 118436^2 + 78065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121230321 - 2² = 20121230317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121230321.

It is not a weakly prime, because it can be changed into another prime (20121230351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060615160 + 10060615161.

It is an arithmetic number, because the mean of its divisors is an integer number (10060615161).

Almost surely, 2^20121230321 is an apocalyptic number.

It is an amenable number.

20121230321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121230321 is an equidigital number, since it uses as much as digits as its factorization.

20121230321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20121230321 its reverse (12303212102), we get a palindrome (32424442423).

The spelling of 20121230321 in words is "twenty billion, one hundred twenty-one million, two hundred thirty thousand, three hundred twenty-one".