321312342 has 64 divisors (see below), whose sum is σ = 737662464. Its totient is φ = 92428800.

The previous prime is 321312331. The next prime is 321312349. The reversal of 321312342 is 243213123.

It is a super-2 number, since 2×321312342² = 206483242243049928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321312349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220717 + ... + 222167.

It is an arithmetic number, because the mean of its divisors is an integer number (11525976).

Almost surely, 2^321312342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321312342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368831232).

321312342 is an abundant number, since it is smaller than the sum of its proper divisors (416350122).

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

321312342 is a wasteful number, since it uses less digits than its factorization.

321312342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its digits is 864, while the sum is 21.

The square root of 321312342 is about 17925.1873630375. The cubic root of 321312342 is about 684.9241338892.

Adding to 321312342 its reverse (243213123), we get a palindrome (564525465).

The spelling of 321312342 in words is "three hundred twenty-one million, three hundred twelve thousand, three hundred forty-two".