121563860 has 72 divisors (see below), whose sum is σ = 283143168. Its totient is φ = 43806400.

The previous prime is 121563847. The next prime is 121563863. The reversal of 121563860 is 68365121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121563863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462089 + ... + 462351.

It is an arithmetic number, because the mean of its divisors is an integer number (3932544).

Almost surely, 2^121563860 is an apocalyptic number.

121563860 is a gapful number since it is divisible by the number (10) 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 121563860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141571584).

121563860 is an abundant number, since it is smaller than the sum of its proper divisors (161579308).

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

121563860 is a wasteful number, since it uses less digits than its factorization.

121563860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 121563860 is about 11025.6002104194. The cubic root of 121563860 is about 495.3758462405.

The spelling of 121563860 in words is "one hundred twenty-one million, five hundred sixty-three thousand, eight hundred sixty".