20121340121 has 2 divisors, whose sum is σ = 20121340122. Its totient is φ = 20121340120.

The previous prime is 20121340091. The next prime is 20121340133. The reversal of 20121340121 is 12104312102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19248787600 + 872552521 = 138740^2 + 29539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121340121 - 2³⁴ = 2941470937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121340121.

It is not a weakly prime, because it can be changed into another prime (20121340021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060670060 + 10060670061.

It is an arithmetic number, because the mean of its divisors is an integer number (10060670061).

Almost surely, 2^20121340121 is an apocalyptic number.

It is an amenable number.

20121340121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121340121 is an equidigital number, since it uses as much as digits as its factorization.

20121340121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121340121 its reverse (12104312102), we get a palindrome (32225652223).

The spelling of 20121340121 in words is "twenty billion, one hundred twenty-one million, three hundred forty thousand, one hundred twenty-one".