2143423420121 has 2 divisors, whose sum is σ = 2143423420122. Its totient is φ = 2143423420120.

The previous prime is 2143423420091. The next prime is 2143423420181. The reversal of 2143423420121 is 1210243243412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1487938875721 + 655484544400 = 1219811^2 + 809620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2143423420121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2143423420181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071711710060 + 1071711710061.

It is an arithmetic number, because the mean of its divisors is an integer number (1071711710061).

Almost surely, 2^{2143423420121} is an apocalyptic number.

It is an amenable number.

2143423420121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143423420121 is an equidigital number, since it uses as much as digits as its factorization.

2143423420121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 2143423420121 its reverse (1210243243412), we get a palindrome (3353666663533).

The spelling of 2143423420121 in words is "two trillion, one hundred forty-three billion, four hundred twenty-three million, four hundred twenty thousand, one hundred twenty-one".