1213231340243 has 4 divisors (see below), whose sum is σ = 1306556827968. Its totient is φ = 1119905852520.

The previous prime is 1213231340227. The next prime is 1213231340249. The reversal of 1213231340243 is 3420431323121.

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

It is not a de Polignac number, because 1213231340243 - 2⁴ = 1213231340227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213231340249) 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, 46662743843 + ... + 46662743868.

It is an arithmetic number, because the mean of its divisors is an integer number (326639206992).

Almost surely, 2^{1213231340243} is an apocalyptic number.

1213231340243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213231340243 is a deficient number, since it is larger than the sum of its proper divisors (93325487725).

1213231340243 is an equidigital number, since it uses as much as digits as its factorization.

1213231340243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93325487724.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 1213231340243 its reverse (3420431323121), we get a palindrome (4633662663364).

The spelling of 1213231340243 in words is "one trillion, two hundred thirteen billion, two hundred thirty-one million, three hundred forty thousand, two hundred forty-three".