1213420553243 has 2 divisors, whose sum is σ = 1213420553244. Its totient is φ = 1213420553242.

The previous prime is 1213420553197. The next prime is 1213420553269. The reversal of 1213420553243 is 3423550243121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213420553243 - 2⁸ = 1213420552987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213420553743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606710276621 + 606710276622.

It is an arithmetic number, because the mean of its divisors is an integer number (606710276622).

Almost surely, 2^{1213420553243} is an apocalyptic number.

1213420553243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213420553243 is an equidigital number, since it uses as much as digits as its factorization.

1213420553243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 1213420553243 its reverse (3423550243121), we get a palindrome (4636970796364).

The spelling of 1213420553243 in words is "one trillion, two hundred thirteen billion, four hundred twenty million, five hundred fifty-three thousand, two hundred forty-three".