243105103421 has 2 divisors, whose sum is σ = 243105103422. Its totient is φ = 243105103420.

The previous prime is 243105103399. The next prime is 243105103427. The reversal of 243105103421 is 124301501342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233182752100 + 9922351321 = 482890^2 + 99611^2 .

It is a cyclic number.

It is not a de Polignac number, because 243105103421 - 2¹⁴ = 243105087037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243105103427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121552551710 + 121552551711.

It is an arithmetic number, because the mean of its divisors is an integer number (121552551711).

Almost surely, 2^243105103421 is an apocalyptic number.

It is an amenable number.

243105103421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243105103421 is an equidigital number, since it uses as much as digits as its factorization.

243105103421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243105103421 its reverse (124301501342), we get a palindrome (367406604763).

The spelling of 243105103421 in words is "two hundred forty-three billion, one hundred five million, one hundred three thousand, four hundred twenty-one".