1306121533243 has 4 divisors (see below), whose sum is σ = 1324517611248. Its totient is φ = 1287725455240.

The previous prime is 1306121533217. The next prime is 1306121533261. The reversal of 1306121533243 is 3423351216031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1306121533243 - 2²¹ = 1306119436091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1306121533199 and 1306121533208.

It is not an unprimeable number, because it can be changed into a prime (1306121533943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9198038896 + ... + 9198039037.

It is an arithmetic number, because the mean of its divisors is an integer number (331129402812).

Almost surely, 2^{1306121533243} is an apocalyptic number.

1306121533243 is a deficient number, since it is larger than the sum of its proper divisors (18396078005).

1306121533243 is an equidigital number, since it uses as much as digits as its factorization.

1306121533243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18396078004.

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 1306121533243 its reverse (3423351216031), we get a palindrome (4729472749274).

The spelling of 1306121533243 in words is "one trillion, three hundred six billion, one hundred twenty-one million, five hundred thirty-three thousand, two hundred forty-three".