121617860 has 96 divisors (see below), whose sum is σ = 330973440. Its totient is φ = 36453888.

The previous prime is 121617833. The next prime is 121617869. The reversal of 121617860 is 68716121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121617869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32822 + ... + 36338.

It is an arithmetic number, because the mean of its divisors is an integer number (3447640).

Almost surely, 2^121617860 is an apocalyptic number.

121617860 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 121617860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165486720).

121617860 is an abundant number, since it is smaller than the sum of its proper divisors (209355580).

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

121617860 is a wasteful number, since it uses less digits than its factorization.

121617860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 121617860 is about 11028.0487848032. The cubic root of 121617860 is about 495.4491858436.

The spelling of 121617860 in words is "one hundred twenty-one million, six hundred seventeen thousand, eight hundred sixty".