1243610163421 has 2 divisors, whose sum is σ = 1243610163422. Its totient is φ = 1243610163420.

The previous prime is 1243610163403. The next prime is 1243610163451.

1243610163421 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709782660196 + 533827503225 = 842486^2 + 730635^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1243610163421 - 2⁷ = 1243610163293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243610163451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621805081710 + 621805081711.

It is an arithmetic number, because the mean of its divisors is an integer number (621805081711).

Almost surely, 2^{1243610163421} is an apocalyptic number.

It is an amenable number.

1243610163421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243610163421 is an equidigital number, since it uses as much as digits as its factorization.

1243610163421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 1243610163421 in words is "one trillion, two hundred forty-three billion, six hundred ten million, one hundred sixty-three thousand, four hundred twenty-one".