1243213213 has 16 divisors (see below), whose sum is σ = 1446522624. Its totient is φ = 1055925760.

The previous prime is 1243213211. The next prime is 1243213217. The reversal of 1243213213 is 3123123421.

It is not a de Polignac number, because 1243213213 - 2¹ = 1243213211 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 (1243213211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1356 + ... + 49882.

It is an arithmetic number, because the mean of its divisors is an integer number (90407664).

Almost surely, 2^1243213213 is an apocalyptic number.

It is an amenable number.

1243213213 is a deficient number, since it is larger than the sum of its proper divisors (203309411).

1243213213 is a wasteful number, since it uses less digits than its factorization.

1243213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48692.

The product of its digits is 864, while the sum is 22.

The square root of 1243213213 is about 35259.2287635450. The cubic root of 1243213213 is about 1075.2642474247.

Adding to 1243213213 its reverse (3123123421), we get a palindrome (4366336634).

The spelling of 1243213213 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, two hundred thirteen".