121308816 has 40 divisors (see below), whose sum is σ = 317167200. Its totient is φ = 39947776.

The previous prime is 121308773. The next prime is 121308823. The reversal of 121308816 is 618803121.

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, 11241 + ... + 19208.

It is an arithmetic number, because the mean of its divisors is an integer number (7929180).

Almost surely, 2^121308816 is an apocalyptic number.

121308816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121308816 is an abundant number, since it is smaller than the sum of its proper divisors (195858384).

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

121308816 is a wasteful number, since it uses less digits than its factorization.

121308816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30543 (or 30537 counting only the distinct ones).

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

The square root of 121308816 is about 11014.0281459600. The cubic root of 121308816 is about 495.0291667336.

The spelling of 121308816 in words is "one hundred twenty-one million, three hundred eight thousand, eight hundred sixteen".