20121444313 has 2 divisors, whose sum is σ = 20121444314. Its totient is φ = 20121444312.

The previous prime is 20121444271. The next prime is 20121444331. The reversal of 20121444313 is 31344412102.

Together with next prime (20121444331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15250521049 + 4870923264 = 123493^2 + 69792^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121444313 - 2⁹ = 20121443801 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121444373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060722156 + 10060722157.

It is an arithmetic number, because the mean of its divisors is an integer number (10060722157).

Almost surely, 2^20121444313 is an apocalyptic number.

It is an amenable number.

20121444313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121444313 is an equidigital number, since it uses as much as digits as its factorization.

20121444313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20121444313 its reverse (31344412102), we get a palindrome (51465856415).

The spelling of 20121444313 in words is "twenty billion, one hundred twenty-one million, four hundred forty-four thousand, three hundred thirteen".