121312120 has 32 divisors (see below), whose sum is σ = 284821920. Its totient is φ = 46414720.

The previous prime is 121312109. The next prime is 121312141. The reversal of 121312120 is 21213121.

It is a self number, because there is not a number n which added to its sum of digits gives 121312120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65011 + ... + 66850.

It is an arithmetic number, because the mean of its divisors is an integer number (8900685).

Almost surely, 2^121312120 is an apocalyptic number.

121312120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312120 is an abundant number, since it is smaller than the sum of its proper divisors (163509800).

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

121312120 is a wasteful number, since it uses less digits than its factorization.

121312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131895 (or 131891 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121312120 is about 11014.1781354761. The cubic root of 121312120 is about 495.0336609426.

Adding to 121312120 its reverse (21213121), we get a palindrome (142525241).

The spelling of 121312120 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred twenty".