121312312 has 32 divisors (see below), whose sum is σ = 250614000. Its totient is φ = 54592000.

The previous prime is 121312297. The next prime is 121312339. The reversal of 121312312 is 213213121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064 + ... + 15712.

Almost surely, 2^121312312 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 121312312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125307000).

121312312 is an abundant number, since it is smaller than the sum of its proper divisors (129301688).

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

121312312 is a wasteful number, since it uses less digits than its factorization.

121312312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13767 (or 13763 counting only the distinct ones).

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

The square root of 121312312 is about 11014.1868515111. The cubic root of 121312312 is about 495.0339221048.

Adding to 121312312 its reverse (213213121), we get a palindrome (334525433).

The spelling of 121312312 in words is "one hundred twenty-one million, three hundred twelve thousand, three hundred twelve".