121660 has 48 divisors (see below), whose sum is σ = 322560. Its totient is φ = 37440.

The previous prime is 121637. The next prime is 121661. The reversal of 121660 is 66121.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1501 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (6720).

2¹²¹⁶⁶⁰ is an apocalyptic number.

121660 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 121660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161280).

121660 is an abundant number, since it is smaller than the sum of its proper divisors (200900).

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

121660 is a wasteful number, since it uses less digits than its factorization.

121660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 121660 is about 348.7979357737. The cubic root of 121660 is about 49.5506402817.

Adding to 121660 its reverse (66121), we get a palindrome (187781).

The spelling of 121660 in words is "one hundred twenty-one thousand, six hundred sixty".