121643243 has 4 divisors (see below), whose sum is σ = 121698720. Its totient is φ = 121587768.

The previous prime is 121643239. The next prime is 121643273. The reversal of 121643243 is 342346121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342346121 = 13 ⋅26334317.

It is a cyclic number.

It is not a de Polignac number, because 121643243 - 2² = 121643239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121643213) 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 3 ways as a sum of consecutive naturals, for example, 24308 + ... + 28881.

It is an arithmetic number, because the mean of its divisors is an integer number (30424680).

Almost surely, 2^121643243 is an apocalyptic number.

121643243 is a deficient number, since it is larger than the sum of its proper divisors (55477).

121643243 is an equidigital number, since it uses as much as digits as its factorization.

121643243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55476.

The product of its digits is 3456, while the sum is 26.

The square root of 121643243 is about 11029.1995629783. The cubic root of 121643243 is about 495.4836520310.

Adding to 121643243 its reverse (342346121), we get a palindrome (463989364).

The spelling of 121643243 in words is "one hundred twenty-one million, six hundred forty-three thousand, two hundred forty-three".