121155312 has 20 divisors (see below), whose sum is σ = 312984680. Its totient is φ = 40385088.

The previous prime is 121155299. The next prime is 121155313. The reversal of 121155312 is 213551121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121155313) 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, 1261987 + ... + 1262082.

It is an arithmetic number, because the mean of its divisors is an integer number (15649234).

Almost surely, 2^121155312 is an apocalyptic number.

121155312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121155312 is an abundant number, since it is smaller than the sum of its proper divisors (191829368).

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

121155312 is a wasteful number, since it uses less digits than its factorization.

121155312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524080 (or 2524074 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 121155312 is about 11007.0573724316. The cubic root of 121155312 is about 494.8202755351.

The spelling of 121155312 in words is "one hundred twenty-one million, one hundred fifty-five thousand, three hundred twelve".