121380816 has 80 divisors (see below), whose sum is σ = 349531200. Its totient is φ = 36071424.

The previous prime is 121380811. The next prime is 121380827. The reversal of 121380816 is 618083121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121380811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11590 + ... + 19418.

It is an arithmetic number, because the mean of its divisors is an integer number (4369140).

Almost surely, 2^121380816 is an apocalyptic number.

121380816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121380816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174765600).

121380816 is an abundant number, since it is smaller than the sum of its proper divisors (228150384).

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

121380816 is a wasteful number, since it uses less digits than its factorization.

121380816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7876 (or 7870 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 121380816 is about 11017.2962200351. The cubic root of 121380816 is about 495.1270850108.

The spelling of 121380816 in words is "one hundred twenty-one million, three hundred eighty thousand, eight hundred sixteen".