1243042301021 has 2 divisors, whose sum is σ = 1243042301022. Its totient is φ = 1243042301020.

The previous prime is 1243042300937. The next prime is 1243042301089. The reversal of 1243042301021 is 1201032403421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1137880891225 + 105161409796 = 1066715^2 + 324286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243042301021 - 2¹⁴ = 1243042284637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243042300021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621521150510 + 621521150511.

It is an arithmetic number, because the mean of its divisors is an integer number (621521150511).

Almost surely, 2^{1243042301021} is an apocalyptic number.

It is an amenable number.

1243042301021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243042301021 is an equidigital number, since it uses as much as digits as its factorization.

1243042301021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1243042301021 its reverse (1201032403421), we get a palindrome (2444074704442).

The spelling of 1243042301021 in words is "one trillion, two hundred forty-three billion, forty-two million, three hundred one thousand, twenty-one".