121321041243 has 4 divisors (see below), whose sum is σ = 161761388328. Its totient is φ = 80880694160.

The previous prime is 121321041223. The next prime is 121321041301. The reversal of 121321041243 is 342140123121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121321041243 - 2⁵ = 121321041211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121321041223) 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, 20220173538 + ... + 20220173543.

It is an arithmetic number, because the mean of its divisors is an integer number (40440347082).

Almost surely, 2^121321041243 is an apocalyptic number.

121321041243 is a deficient number, since it is larger than the sum of its proper divisors (40440347085).

121321041243 is an equidigital number, since it uses as much as digits as its factorization.

121321041243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40440347084.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 121321041243 its reverse (342140123121), we get a palindrome (463461164364).

The spelling of 121321041243 in words is "one hundred twenty-one billion, three hundred twenty-one million, forty-one thousand, two hundred forty-three".