121243312 has 20 divisors (see below), whose sum is σ = 236355160. Its totient is φ = 60248448.

The previous prime is 121243301. The next prime is 121243319. The reversal of 121243312 is 213342121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121243312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20637 + ... + 25852.

It is an arithmetic number, because the mean of its divisors is an integer number (11817758).

Almost surely, 2^121243312 is an apocalyptic number.

It is an amenable number.

121243312 is a deficient number, since it is larger than the sum of its proper divisors (115111848).

121243312 is a wasteful number, since it uses less digits than its factorization.

121243312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46660 (or 46654 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 121243312 is about 11011.0540821485. The cubic root of 121243312 is about 494.9400491963.

Adding to 121243312 its reverse (213342121), we get a palindrome (334585433).

The spelling of 121243312 in words is "one hundred twenty-one million, two hundred forty-three thousand, three hundred twelve".