1243332978213 has 4 divisors (see below), whose sum is σ = 1657777304288. Its totient is φ = 828888652140.

The previous prime is 1243332978157. The next prime is 1243332978227. The reversal of 1243332978213 is 3128792333421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1243332978213 - 2⁹ = 1243332977701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243332978253) 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, 207222163033 + ... + 207222163038.

It is an arithmetic number, because the mean of its divisors is an integer number (414444326072).

Almost surely, 2^{1243332978213} is an apocalyptic number.

It is an amenable number.

1243332978213 is a deficient number, since it is larger than the sum of its proper divisors (414444326075).

1243332978213 is an equidigital number, since it uses as much as digits as its factorization.

1243332978213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414444326074.

The product of its digits is 1306368, while the sum is 48.

The spelling of 1243332978213 in words is "one trillion, two hundred forty-three billion, three hundred thirty-two million, nine hundred seventy-eight thousand, two hundred thirteen".