20344145211121 has 2 divisors, whose sum is σ = 20344145211122. Its totient is φ = 20344145211120.

The previous prime is 20344145211119. The next prime is 20344145211133. The reversal of 20344145211121 is 12111254144302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11147718992400 + 9196426218721 = 3338820^2 + 3032561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344145211121 - 2¹ = 20344145211119 is a prime.

Together with 20344145211119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20344146211121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172072605560 + 10172072605561.

It is an arithmetic number, because the mean of its divisors is an integer number (10172072605561).

Almost surely, 2^{20344145211121} is an apocalyptic number.

It is an amenable number.

20344145211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344145211121 is an equidigital number, since it uses as much as digits as its factorization.

20344145211121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 20344145211121 its reverse (12111254144302), we get a palindrome (32455399355423).

The spelling of 20344145211121 in words is "twenty trillion, three hundred forty-four billion, one hundred forty-five million, two hundred eleven thousand, one hundred twenty-one".