121815680 has 64 divisors (see below), whose sum is σ = 332830080. Its totient is φ = 41763840.

The previous prime is 121815679. The next prime is 121815703. The reversal of 121815680 is 86518121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 9116 + ... + 18075.

It is an arithmetic number, because the mean of its divisors is an integer number (5200470).

Almost surely, 2^121815680 is an apocalyptic number.

121815680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121815680 is an abundant number, since it is smaller than the sum of its proper divisors (211014400).

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

121815680 is an equidigital number, since it uses as much as digits as its factorization.

121815680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27217 (or 27205 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 121815680 is about 11037.0140889645. The cubic root of 121815680 is about 495.7176679728.

The spelling of 121815680 in words is "one hundred twenty-one million, eight hundred fifteen thousand, six hundred eighty".