121321312 has 24 divisors (see below), whose sum is σ = 272973456. Its totient is φ = 51994752.

The previous prime is 121321307. The next prime is 121321339. The reversal of 121321312 is 213123121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270583 + ... + 271030.

It is an arithmetic number, because the mean of its divisors is an integer number (11373894).

Almost surely, 2^121321312 is an apocalyptic number.

It is an amenable number.

121321312 is an abundant number, since it is smaller than the sum of its proper divisors (151652144).

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

121321312 is an equidigital number, since it uses as much as digits as its factorization.

121321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541630 (or 541622 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 121321312 is about 11014.5954079122. The cubic root of 121321312 is about 495.0461637727.

Adding to 121321312 its reverse (213123121), we get a palindrome (334444433).

The spelling of 121321312 in words is "one hundred twenty-one million, three hundred twenty-one thousand, three hundred twelve".