1321343212 has 72 divisors (see below), whose sum is σ = 2756164320. Its totient is φ = 552464640.

The previous prime is 1321343197. The next prime is 1321343227. The reversal of 1321343212 is 2123431231.

It is an interprime number because it is at equal distance from previous prime (1321343197) and next prime (1321343227).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3230464 + ... + 3230872.

It is an arithmetic number, because the mean of its divisors is an integer number (38280060).

Almost surely, 2^1321343212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321343212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1378082160).

1321343212 is an abundant number, since it is smaller than the sum of its proper divisors (1434821108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321343212 is a wasteful number, since it uses less digits than its factorization.

1321343212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 782 counting only the distinct ones).

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

The square root of 1321343212 is about 36350.2848957199. The cubic root of 1321343212 is about 1097.3332680852. Note that the first 3 decimals are identical.

Adding to 1321343212 its reverse (2123431231), we get a palindrome (3444774443).

The spelling of 1321343212 in words is "one billion, three hundred twenty-one million, three hundred forty-three thousand, two hundred twelve".