121863 has 12 divisors (see below), whose sum is σ = 189240. Its totient is φ = 69552.

The previous prime is 121853. The next prime is 121867. The reversal of 121863 is 368121.

It is not a de Polignac number, because 121863 - 2⁸ = 121607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

121863 is a lucky number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 268 + ... + 561.

It is an arithmetic number, because the mean of its divisors is an integer number (15770).

2¹²¹⁸⁶³ is an apocalyptic number.

121863 is a deficient number, since it is larger than the sum of its proper divisors (67377).

121863 is an equidigital number, since it uses as much as digits as its factorization.

121863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 839 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 121863 is about 349.0888139142. The cubic root of 121863 is about 49.5781847788.

Adding to 121863 its reverse (368121), we get a palindrome (489984).

The spelling of 121863 in words is "one hundred twenty-one thousand, eight hundred sixty-three".