121829 has 4 divisors (see below), whose sum is σ = 126060. Its totient is φ = 117600.

The previous prime is 121789. The next prime is 121843. The reversal of 121829 is 928121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 928121 = 149 ⋅6229.

It can be written as a sum of positive squares in 2 ways, for example, as 30625 + 91204 = 175^2 + 302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (31515).

2¹²¹⁸²⁹ is an apocalyptic number.

It is an amenable number.

121829 is a deficient number, since it is larger than the sum of its proper divisors (4231).

121829 is an equidigital number, since it uses as much as digits as its factorization.

121829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230.

The product of its digits is 288, while the sum is 23.

The square root of 121829 is about 349.0401123080. The cubic root of 121829 is about 49.5735735485.

The spelling of 121829 in words is "one hundred twenty-one thousand, eight hundred twenty-nine".