1213243213 has 24 divisors (see below), whose sum is σ = 1518526464. Its totient is φ = 943928640.

The previous prime is 1213243201. The next prime is 1213243219. The reversal of 1213243213 is 3123423121.

It is not a de Polignac number, because 1213243213 - 2¹³ = 1213235021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213243219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 336820 + ... + 340402.

It is an arithmetic number, because the mean of its divisors is an integer number (63271936).

Almost surely, 2^1213243213 is an apocalyptic number.

1213243213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213243213 is a deficient number, since it is larger than the sum of its proper divisors (305283251).

1213243213 is an equidigital number, since it uses as much as digits as its factorization.

1213243213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725 (or 3664 counting only the distinct ones).

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

The square root of 1213243213 is about 34831.6409748378. The cubic root of 1213243213 is about 1066.5534466525.

Adding to 1213243213 its reverse (3123423121), we get a palindrome (4336666334).

The spelling of 1213243213 in words is "one billion, two hundred thirteen million, two hundred forty-three thousand, two hundred thirteen".