121866 has 16 divisors (see below), whose sum is σ = 256800. Its totient is φ = 38448.

The previous prime is 121853. The next prime is 121867. The reversal of 121866 is 668121.

It is not an unprimeable number, because it can be changed into a prime (121867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421 + ... + 648.

It is an arithmetic number, because the mean of its divisors is an integer number (16050).

2¹²¹⁸⁶⁶ is an apocalyptic number.

121866 is an abundant number, since it is smaller than the sum of its proper divisors (134934).

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

121866 is a wasteful number, since it uses less digits than its factorization.

121866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 576, while the sum is 24.

The square root of 121866 is about 349.0931107885. The cubic root of 121866 is about 49.5785916108.

Adding to 121866 its reverse (668121), we get a palindrome (789987).

The spelling of 121866 in words is "one hundred twenty-one thousand, eight hundred sixty-six".